Excel error when selected large files

FlgExportExcelSuccess = ClsFrmMain.ExportToExcel(intTabnumber, dtSelectedRows, StrExcelLocation, "Diary" & intTabnumber, xlapp) = True
                     

Function ExportToExcel(ByVal intCreateNew As Integer, ByVal dtGridData As DataTable, ByVal FilePath As String, ByVal StrSheetname As String, Optional ByVal xlApp As Excel.Application = Nothing) As Boolean

        Dim xlWorkBook As Excel.Workbook = Nothing
        Dim xlWorkSheet As Excel.Worksheet = Nothing


        Application.DoEvents()
        Try
            FrmMain.Cursor = Cursors.WaitCursor
            xlApp.DisplayAlerts = False
            If intCreateNew = 0 Then
                xlApp.Workbooks.Add()
                xlApp.Workbooks(1).SaveAs(FilePath)
            End If
            xlWorkBook = xlApp.Workbooks.Open(FilePath)
            xlWorkBook.Worksheets.Add(After:=xlWorkBook.Worksheets(xlWorkBook.Worksheets.Count))
            xlWorkSheet = xlWorkBook.Worksheets(xlWorkBook.Worksheets.Count)
            xlWorkSheet.Name = StrSheetname
            If System.IO.File.Exists(FilePath) Then
                System.IO.File.Delete(FilePath)
            End If
            Dim dtRowCount As Integer = dtGridData.Rows.Count
            Dim dtColCount As Integer = dtGridData.Columns.Count
            Dim objXlColHeaderData(1, dtGridData.Columns.Count) As Object
            Application.DoEvents()
            For i As Integer = 0 To dtColCount - 1
                objXlColHeaderData(0, i) = dtGridData.Columns(i).ColumnName
            Next
            Dim objXlData(dtRowCount, dtColCount) As Object
            For iRow As Integer = 0 To dtRowCount - 1
                Application.DoEvents()
                For iCol As Integer = 0 To dtColCount - 1
                    Application.DoEvents()
                    If Not IsDBNull(dtGridData.Rows(iRow).Item(iCol)) Then
                        objXlData(iRow, iCol) = dtGridData.Rows(iRow).Item(iCol)
                    Else
                        objXlData(iRow, iCol) = ""
                    End If
                Next
            Next
            Dim xlRange As Excel.Range = xlWorkSheet.Range("A1")
            xlRange = xlRange.Resize(dtRowCount, dtColCount)
            xlRange.Value = objXlColHeaderData
            xlWorkSheet.Range(xlWorkSheet.Cells(1, 1), xlWorkSheet.Cells(1, dtColCount)).Font.Bold = True
            xlRange = xlWorkSheet.Range("A2")
            xlRange = xlRange.Resize(dtRowCount, dtColCount)
            xlRange.Value = objXlData -----error here
            With xlWorkSheet
                .Range(.Cells(1, 1), .Cells(1, 1)).Select()
            End With
            With xlWorkSheet.Application.ActiveWindow
                .SplitColumn = 0
                .SplitRow = 1
            End With
            xlWorkSheet.Application.ActiveWindow.FreezePanes = True
            Application.DoEvents()
            xlWorkBook.SaveAs(FilePath)
            FrmMain.Cursor = Cursors.Default
            Return True
        Catch ex As Exception
            MessageBox.Show(ex.Message, "ErrorIn ExportToExcel", MessageBoxButtons.OK, MessageBoxIcon.Error)
            xlWorkSheet = Nothing
            'xlWorkBook.Close(0)
            xlWorkBook = Nothing
            'xlApp.Quit()
            xlApp = Nothing
            FrmMain.Cursor = Cursors.Default
        End Try
    End Function

Error:
exception from hresult 0x800a03ec