private void Btn_SelectExcelFile(object sender, EventArgs e) { var selectFilePath = WinFormHelper.SelectFile("excel (*.xlsx)|*.xlsx"); if (selectFilePath.Length > 0) { if (((System.Windows.Forms.Control)sender).Name == "SelectFileBtn1") { this.filePath1.Text = selectFilePath; } if (((System.Windows.Forms.Control)sender).Name == "SelectFileBtn2") { this.filePath2.Text = selectFilePath; } } }