For i As Integer = 0 To DataGridView1.Rows.Count - 1

            For j As Integer = 0 To DataGridView1.Columns.Count - 1

                If j = 3 Then GoTo 100 'Bu satırı ekleyin...

                Try

                    Dim myRange As Microsoft.Office.Interop.Excel.Range = DirectCast(sheet1.Cells(StartRow + i, StartCol + j), Microsoft.Office.Interop.Excel.Range)

                    myRange.Value2 = If(DataGridView1(j, i).Value Is Nothing, "", DataGridView1(j, i).Value)

                Catch

                End Try

100:'Bu satırı ekleyin...

            Next

        Next