Try using the condition like this:
If(IsDBNull(row("ColumnName")) OrElse String.IsNullOrEmpty(row("ColumnName").ToString()), "Empty column values", "Got the values")
Try using the condition like this:
If(IsDBNull(row("ColumnName")) OrElse String.IsNullOrEmpty(row("ColumnName").ToString()), "Empty column values", "Got the values")