For a complete explanation of this code example, see Walkthrough: Validating Data in the Windows Forms Data Grid View Control. Form Private With Events data Grid View1 As New Data Grid View() Private binding Source1 As New Binding Source() Public Sub New() ' Initialize the form. Focus() End Sub Protected Overloads Overrides Function Commit(By Val data Source As _ Currency Manager, By Val row Num As Integer) As Boolean If is Editing Then is Editing = False Set Column Value At Row(data Source, row Num, Column Combo Box. Hide() End Sub End Class Public Class No Key Up Combo Inherits Combo Box Protected Overrides Sub Wnd Proc(By Ref m As System.
If the event handler for the Cell Validating event finds that the value is an empty string, the Data Grid View prevents the user from exiting the cell until a non-empty string is entered. Load ' Initialize the Binding Source and bind the Data Grid View to it. Data Source = Get Data("select * from Customers") Grid View1. Auto Resize Columns( _ Data Grid View Auto Size Columns Mode.