How do I allow the user to enter a negative number in a column on a grid with validation?

Windows Forms Data Controls and Databinding

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    - how to host different controls in the same column in DataGridView control There're two ways to do this: 1). Cast a DataGridViewCell to a certain cell type that exists. For example, convert a DataGridViewTextBoxCell to DataGridViewComboBoxCell type. 2). Create a control and add it into the controls collection of DataGridView, set its location and size to fit the cell that to be host. See my sample code below which illustrates the tricks. Code Snippet private void Form5_Load( object sender, EventArgs e) { DataTable dt = new DataTable (); dt.Columns.Add( "name" ); for ( int j = 0; j < 10; j++) { dt.Rows.Add( "" ); } this .dataGridView1.DataSource = dt; this .dataGridView1.Columns[0].Width = 200; /* * First method : Convert to an existed cell type such ComboBox cell,etc */ DataGridViewComboBoxCell ComboBoxCell = new DataGridViewComboBoxCell (); ComboBoxCell.Items.AddRange( new string [] { "aaa" , "bbb" , "ccc" }); this .dataGridView1[0, 0] = ComboBoxCell; this .dataGridView1[0, 0].Value = "bbb" ; DataGridViewTextBoxCell TextBoxCell = new DataGridViewTextBoxCell (); this .dataGridView1[0, 1] = TextBoxCell; this .dataGridView1[0, 1].Value = "some text" ; DataGridViewCheckBoxCell CheckBoxCell = new DataGridViewCheckBoxCell (); CheckBoxCell.Style.Alignment = DataGridViewContentAlignment .MiddleCenter; this .dataGridView1[0, 2] = CheckBoxCell; this .dataGridView1[0, 2].Value = true ; /* * Second method : Add control to the host in the cell */ DateTimePicker dtp = new DateTimePicker (); dtp.Value = DateTime .Now.AddDays(-10); //add DateTimePicker into the control collection of the DataGridView this .dataGridView1.Controls.Add(dtp); //set its location and size to fit the cell dtp.Location = this .dataGridView1.GetCellDisplayRectangle(0, 3, true ).Location; dtp.Size = this .dataGridView1.GetCellDisplayRectangle(0, 3, true ).Size; } Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Removing multiple items in a ListView "at the same time" Classic trick, iterate backwards: for (int ix = listView1.SelectedIndices.Count-1; ix >= 0; --ix) listView1.Items.RemoveAt(listView1.SelectedIndices[ix]); These would be easier though, ListView is smart enough to make this work: foreach (ListViewItem item in listView1.SelectedItems) listView1.Items.Remove(item); Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - How to lock a control on a design form Hi, That is the right way of doing it although you should probably check the the PropertyDescriptor exists before calling SetValue. PropertyDescriptor prop = TypeDescriptor.GetProperties(myControl)["Locked"]; if (prop != null) { prop.SetValue(myControl, true); } Martin Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - DataGridView ImageCell Description Hi : how you handle adding image cell without image column but for your question I think you can do it in cellpaint event of datagridview , paint image and draw string using DGI+ Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Usefullness of any event Theory: "The value of an event to a programmer is inversely related to the number of times it fires." Am I wrong about this Any thoughts will be appreciated. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - column caption You have to add a tablestyle to the datagrid to change the header text of a datagrid column http://msdn2.microsoft.com/en-us/library/system.windows.forms.datagridtablestyle.aspx Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - How do I reference a control's properties? If you're inside a form event (like a button click), then something lik this should work: this->Textbox1->Text = "Hello World"; (provided your casing is correct). In traditional Windows.Forms programming, every form is created as an instance, and event handlers are member functions (called methods). All instance functions have a hidden "this" parameter that points to the current instance. The -> is used because both TextBox and String are reference types, accessed via pointers (they actual data is always on the heap). Conventionally, the "this->" part is skipped, but it's useful for illustration of what's truly happening, so I always use it :) -Ryan / Kardax Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Record Locking and Transactions in Strongly Typed Datasets Anyone My latest attempt follows: I tried to begin a transaction from the TableAdapter's connection first, which seems to do its thing without error. But then, openning the table and filling the TA returns an error. Me .taNewPayment.Connection.Open() Me .taNewPayment.Connection.BeginTransaction(IsolationLevel.Serializable) '************************** Me .taNewPayment.Fill( Me .DsPaymentProcessing.PAYMENT, Me .txtCardID.Text) The following error is raised: InvalidOperationException: ExecuteReader requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized. Can anyone tell me what this means Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - hide and show a process??? You can use the following code, called by a timer, event, ect... HIDE button1.Hide(); OR button1.Visible = false; Show button1.Show(); or button1.Visible = true; Hope this helps Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - TreeView Comtrol: Add buttons to nodes in TreeView control Hi,Frank You can try implementing a custom node inherited from the TreeNode class,but I think there's a lot of work to do, have a look at this thread in ASP.NET forum ,I recommend you to post asp.net problems on that forum for better responses, this forum is mainly for windows form application development.However, I wonder why do you want to add buttons to nodes, does the click event on node not enough Hope it helps. Best Regards. Ye Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Access Denied Reading Registry Generally, all users can read this area of the registry. Make sure to specify RegistryKeyPermissionCheck.ReadSubTree when you open the key if you do not plan to write. If you need to write to this area of the registry, you need to be an administrator. In this case, consider adding the code to your installation program. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - How do I Find The Product Code? You just make it up! It needs to be a unique identifier, so that each bootstrapper manifest has a unique ProductCode. This is the Unique ID we use to select, load, build, etc... bootstrapper packages. As you can tell, we've got a bit of a "best practice" product code: Manufacturer.ProductName.Version Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Menustrip reading XML any ideas Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Can we Add ListItem objects to ListBox ? It is only for ListView. You can add any object to ListBox, but it must have a suitable ToString() method. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Using the Windows password in my application P/Invoke the LogonUser() API function. For example: using System; using System.Windows.Forms; using System.Runtime.InteropServices; namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); txtUsername.Text = Environment.UserName; txtDomain.Text = Environment.UserDomainName; } private void btnLogon_Click(object sender, EventArgs e) { IntPtr token; bool ok = LogonUser(txtUsername.Text, txtDomain.Text, txtPassword.Text, 2, 0, out token); if (ok) CloseHandle(token); if (ok) MessageBox.Show("Logon successful"); else MessageBox.Show("Logon failed"); } // P/Invoke declarations [DllImport("advapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)] public static extern bool LogonUser(string username, string domain, string password, int dwLogonType, int dwLogonProvider, out IntPtr phToken); [DllImport("kernel32.dll", SetLastError = true)] internal static extern bool CloseHandle(IntPtr handle); } } Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Bring to Front Form Problem Use Show() instead of Show(mainForm). Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Programatically trigger keyboard shortcut You could use SendKeys.Send(). Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Dump controles to image /saving to image Yorthen, To get a graphics object you need to override the Paint event of your splitContainer. Then you'll have a PaintEventArgs object as a paremeter, which you can use it to access the graphics object inside it. Please do not forget to call Base.Paint() so all drawing from the base class will be done. Otherwise you will be responsible for all control repaint, which is not so easy. Was this helpful Bruno Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Value, Text pair in combo box Hi, Prashweenet, Based on my understanding, you want to show both the value and text in your ComboBox, don't you I think it is possible with a Expression column in your DataSource. For example, Code Block private void Form1_Load( object sender, EventArgs e) { DataTable datatable = new DataTable (); datatable.Columns.Add( "text" ); datatable.Columns.Add( "value" ); datatable.Rows.Add( "ABC" , "bcd" ); datatable.Rows.Add( "bcd" , "ABC" ); datatable.Columns.Add( "exp" ); datatable.Columns[ "exp" ].Expression = "text+','+value" ; comboBox1.DisplayMember = "exp" ; comboBox1.ValueMember = "value" ; comboBox1.DataSource = datatable; } More info http://msdn2.microsoft.com/en-us/library/system.data.datacolumn.expression(VS.80).aspx Hope this helps, Regards Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - problem while handling dataerror Hi no-cool, Yes, this is the way DataGridView.DataError event works. When you set e.Cancel to true,the event will be canceled. For further information, check this article on MSDN Hope this helps. Regards Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Simulating a paste from the clipboard via code? Hi ChaosBlade You can try to use Clipboard class. The Clipboard class provides methods that you can use to interact with the Windows operating system Clipboard feature. You code may be something like that. Code Snippet IDataObject iData = Clipboard .GetDataObject(); if (iData.GetDataPresent( DataFormats .Text)) { this .richTextBox1.Text = ( string )iData.GetData( DataFormats .Text); } Hope it helps. Regards Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - DataGridViewComboBoxCell BackColor in Vista I do not believe that is possible. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Need Help with Variables and Databinding OK. Clearing the Textbox each time before databinding it fixed Problem #2. DisplayTextBox.DataBindings.Clear() DisplayTextBox.DataBindings.Add("Text", ds2.Tables(0), "SectionText") Any suggestion on Problem #1 (using variables in the Select statement) Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - updating DataGridView when underlying data has changed You could use a BindingList instead of a List... Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - DataGridView - refreshing calculated columns when move from column to column If the calculated value is not bound the datagridview does not know the Cell value has changed. You will have to use the CellInvalidate method to get the cell to refresh itself after you change a value in one of the bound columns Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Shadow around TabControl border It is your currently selected Windows XP Visual Styles theme that paints the shadow. Check this thread for code that selectively turns Visual Styles off for a TabControl. You'll still get a 3D border, no shadow though. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - listview DrawItem NEED HELP i have write my own DrawItem method for LISTVIEW and its working OK execpt i don't know what to do if the ITEM or SUBITEM text does not fit in the column width. On the default DrawItem method if a text is too long for example I LIKE MY HOLIDAY it appears as I LIKE... How to achive same rezult Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - How to run the MSI installer in the elevated mode Have you created setup.exe or setup.msi By default Windows Vista will prompt to elevate any application with the word 'setup' 'install' or 'update'. so your application will be elevated unless you have included a windows vista UAC manifest explicitly telling it not to. You might check out this article on User Account Control in Windows Vista. http://technet.microsoft.com/en-us/windowsvista/aa905117.aspx It explains how you can embed a UAC manifest in an application to force the application to run elevated. -scott Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Recordset problem When you search the net, you will find several examples. First open a database connection , then open a reader, connect to the database, create a command and send the result to the reader. You can view the code here for making a simple database connection in .net . Hope it helps. Damiaan Edit: consider using a ScalarQuery from the dataAdaptor if it is for a single value. This will limit the amout of code you'll have to write Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - View Data Grid (for xml database) Hi! You mean VS2005 can't open .XSD file Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Creating the bootstrapper exe Is there a way to create the setup.exe without having it signed during the build This way I can update the url is the setup.exe at the customer site, and then apply the digital signature. I need to be able to do this through an automated process. Anthony Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms
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    - Setup Project - Customizing the User's Shell You want the File Types on Target Machine view. You'd right-click on the File Types on Target Machine node and add file type MP3. The properties page of that file type lets you enter .mp3 in the Extensions and Command lets you browse to your executable. . Right-click on the MP3 node and add your verb with Add Action, there you add the name that shows up in the context menu, the arguments (like "%1") and the verb. Tag: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation? Windows Forms

Coleby

This is my 1st C# VS proj and I'm having some difficulty validating data entered on a column.

HEre's the code.

if (dgExtents.Columns[e.ColumnIndex].Name == "Sequence") //number is currently < 300

{

dgExtents.Rows[e.RowIndex].ErrorText = "";

int newInteger;

if (dgExtents.Rows[e.RowIndex].IsNewRow) { return; }

if (!int.TryParse(e.FormattedValue.ToString(),

out newInteger) || newInteger < 0)

{

e.Cancel = true;

dgExtents.Rows[e.RowIndex].ErrorText = "the Sequence value must be a number";

}

if (string.IsNullOrEmpty(e.FormattedValue.ToString()))

{

dgExtents.Rows[e.RowIndex].ErrorText =

"Sequence is a required field";

e.Cancel = true;

}

Re: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation?

Friendly Dog

The condition you use specifically say negative number is not allowed:

if (!int.TryParse(e.FormattedValue.ToString(), out newInteger) || newInteger < 0)

translate into english is

"if the number format is invalid OR the number is negative"

Re: Windows Forms Data Controls and Databinding How do I allow the user to enter a negative number in a column on a grid with validation?

Coleby

thanks again FD.

Very simple.