ติดปัญหาครับ จะมีไหมที่ให้ ใช้คำสั่ง Sql ลบ ข้อมูลบาง column ช่วยด้วยครับ

Dim SqlDelete As String = "DELETE [Picture] FROM Employee"
                SqlDelete &= " WHERE(IDEmployee = '" & TbxIDEmployee.Text & "')"
                Dim cmd As New OleDbCommand(SqlDelete, connect)
                cmd.CommandType = CommandType.Text
                cmd.CommandText = SqlDelete
                cmd.Connection = connect
                cmd.ExecuteNonQuery()

 Dim Sql As String
                'Sql = "UPDATE Employee SET "
                'Sql += "Picture= '" & Picture.ImageLocation = "" & "'"
                'Sql += " WHERE IDEmployee= '" & TbxIDEmployee.Text & "' "
                'Dim cmd As New OleDbCommand
                'cmd.CommandType = CommandType.Text
                'cmd.CommandText = Sql
                'cmd.Connection = connect
                'cmd.ExecuteNonQuery()

If dataset.Tables("Employee").Rows(index)("Picture") IsNot DBNull.Value Then
            Dim imgByte() As Byte = dataset.Tables("Employee").Rows(index)("Picture")
            Dim imgstremam As New MemoryStream(imgByte)
            Picture.Image = Image.FromStream(imgstremam)
        ElseIf dataset.Tables("Employee").Rows(index)("Picture") Is DBNull.Value Then
            Picture.Image = Nothing
        End If