BKI_DichVuMatDat.WinFormControls.openFileDialog C# (CSharp) Method

        public static string openFileDialog()
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            // Set filter options and filter index.
            openFileDialog1.Filter = "xls Files|*.xls|xlsx Files|*.xlsx|All Files (*.*)|*.*";
            openFileDialog1.FilterIndex = 1;
            openFileDialog1.Multiselect = false;
            var userClickedOK = openFileDialog1.ShowDialog();
            if (userClickedOK == System.Windows.Forms.DialogResult.OK)
            {
                return openFileDialog1.FileName;
            }
            return "";
        }