Validation
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Validation with RadGridView for WinForms In this video you will learn how to use the event-based Validation functionality in RadGridView for WinForms. Learn how to use the CellValidating and RowValidating events to ensure user input is valid. (Runtime: 08:47) |
To prevent invalid input, wire the ValueChanging and ValueChanged events of the grid and add custom validation logic. Below is a simple example that demonstrates how to reject strings longer than 10 characters:
Handling the value changed event
void radGridView1_ValueChanging(object sender, Telerik.WinControls.UI.ValueChangingEventArgs e)
{
if (e.NewValue.GetType() == typeof(string))
{
if (e.NewValue.ToString().Length > 10)
{
{
e.Cancel = true;
}
}
}
}
Private Sub RadGridView1_ValueChanging(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.ValueChangingEventArgs) Handles RadGridView1.ValueChanging
If e.NewValue.GetType() Is GetType(String) Then
If e.NewValue.ToString().Length > 10 Then
If True Then
e.Cancel = True
End If
End If
End If
End Sub