SaveExcelToResponseメソッドを呼び出すと後続のサーバー処理が実行されません。 【再現コード】 Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load If IsPostBack Then Return FpSpread1.ActiveSheetView.SetValue(0, 0, "abc") End Sub Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click FpSpread1.SaveExcelToResponse("Book1.xlsx", FarPoint.Excel.ExcelSaveFlags.UseOOXMLFormat) System.Diagnos