To validate the text entered into a datagrid add a handler to the DatagridTextboxColumn’s validating event. Here is some sample code. Dim ds As New DataSet Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim conn As SqlConnection Dim strConn As String Dim strSQL As String Dim da As SqlDataAdapter strConn … Continue reading Validate data entered into textboxcolumn