VB.NET 2005 DataGridView : How to do DataGridView cell validation?

Q: How to do DataGridView cell validation?

A: If you want take input directly in datagridview, column of string type takes any input but DataGridView default error dialog is shown when making invalid input i-e 123a for integer type column that asks to handle the DataError event of datagridview .
So you can use CellValidating event of DataGridView to validate integer type column as well as other.

Steps:

• Use DataGridView's CellValidating event
• Get the cell for which the event is called
• If the cell is in EditMode then
• Perform validation

CellValidating Event:

Code:

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    Private Sub DataGridView1_CellValidating(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating
        Dim cell As DataGridViewCell = DataGridView1.Item(e.ColumnIndex, e.RowIndex)

        If cell.IsInEditMode Then
            Dim c As Control = DataGridView1.EditingControl

            Select Case DataGridView1.Columns(e.ColumnIndex).Name
                Case "sessno", "rno"
                    c.Text = CleanInputNumber(c.Text)
                Case "name"
                    c.Text = CleanInputAlphabet(c.Text)
            End Select
        End If
    End Sub

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Utility Functions:

Code:

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    Private Function CleanInputAlphabet(ByVal str As String) As String
        Return System.Text.RegularExpressions.Regex.Replace(str, "[0-9\b\s-]", "")
    End Function

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Code:

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    Private Function CleanInputNumber(ByVal str As String) As String
        Return System.Text.RegularExpressions.Regex.Replace(str, "[a-zA-Z\b\s-.]", "")
    End Function

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