Datagridview cellvalidating editingcontrol
For example, for a In general, it is better to use the Cell Parsing event whenever you need to convert/change the value in a cell.
From within that event, you can indicate that the user's value is invalid by setting the Error Text value of the cell or row.
Fill(data) Return data End Function Storing sensitive information, such as a password, within the connection string can affect the security of your application.
which causes an Invalid Cast Exception (didn't check that could only be an integer).
Text = "Data Grid View validation demo (disallows empty Company Name)" End Sub Private Sub Form1_Load(By Val sender As System. All Cells Except Header) End Sub Private Sub data Grid View1_Cell Validating(By Val sender As Object, _ By Val e As Data Grid View Cell Validating Event Args) _ Handles data Grid View1. Header Text ' Abort validation if cell is not in the Company Name column. Equals("Company Name") Then Return ' Confirm that the cell is not empty.
Form All following code is part of private string last Edited Cell Value; private void dgv Replenish_Cell Begin Edit(object sender, Data Grid View Cell Cancel Event Args e) private void dgv Replenish_Cell Validating(Object sender, Data Grid View Cell Validating Event Args e) private void dgv Replenish_Cell Clicked(object sender, Data Grid View Cell Event Args e) private void dgv Replenish_Cell Formatting(object sender, Data Grid View Cell Formatting Event Args e) private void dgv Replenish_Cell Value Changed(object sender, Data Grid View Cell Event Args e) The truth is, it's really very hard to refactor this code out of the code behind once it's been written like this.
I would suggest that you start writing your tests first, for now at least.
It works fairly well, however, I want to force the cell to stay in edit mode and have focus when the input fails the validation that I do in my custom control. For those interested; I got a copy of the editingcontrol from the Edit Control Showing event handler for the datagrid , then I checked the error value (i'm using an errorprovider for my custom masked textbox control) in the Cell Validating event handler and set e.cancel to true if and error exists (preventing the user from leaving the cell).
This works fine when the user control is put on a form (in the On Lost Focus event I check if my error variable has been set and call the Focus event if it has), but I cannot get it to work in the DGV. Cancel in the On Validating event and various other things, none of which work.