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I have this export function that allows me to export 2 grid views into 2 separated worksheets in one excel.

But my problems are:

1. How can I have a usual popup window like usual download when I click on export button to prompt user to OPEN, SAVE AS, CANCEL of the download instead of saving it to a specific location (currently what I am doing in my codes)?

2. How can I set a code to enable wraptext = true for all my cells and also auto format the column height and width to fixed all the text so that it does not show ###### for date as an example when column width is too small when excel is opened.

protected void EXPORT_BUTTON_Click(object sender, EventArgs e)
Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
// creating new WorkBook within Excel application
Microsoft.Office.Interop.Excel._Workbook workbook  =  app.Workbooks.Add(Type.Missing);
String DT1 = "Data table 1";
String DT2 = "Data table 2";
ExportToExcel(app, workbook, Gridview1, DT1, 1);
ExportToExcel(app, workbook, Gridview2, DT2, 2);   
public void ExportToExcel(Microsoft.Office.Interop.Excel._Application app, Microsoft.Office.Interop.Excel._Workbook workbook, GridView gridview, string SheetName, int sheetid)

    // see the excel sheet behind the program
    app.Visible = true;
    // get the reference of first sheet. By default its name is Sheet1.
    // store its reference to worksheet

    worksheet = (Excel.Worksheet)workbook,Worksheets.Add();
    // changing the name of active sheet
    worksheet.Name = SheetName;
    // storing header part in Excel
    for (int i = 1; i < gridview.Columns.Count + 1; i++)
        worksheet.Cells[1, i] = gridview.Columns[i - 1].HeaderText;

    // storing Each row and column value to excel sheet
    for (int i = 0; i < gridview.Rows.Count - 1; i++)
        for (int j = 0; j < gridview.Columns.Count; j++)
            worksheet.Cells[i + 2, j + 1] = gridview.Rows[i].Cells[j].Text.ToString();
    //save the application
    workbook.SaveAs(@"C:\Users\test\Desktop\Test\" + datetime.ToString("dd-MM-yyyy_hh-mm-ss") + ".xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
Updated 14-Oct-15 21:38pm

You open file save dialog before saving, collect the selected path from the dialog and then call Save on that path.
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After saving it to a file on the server you can then write the file to the filestream. Google " download file client" for code samples. However what you're doing is not supported and is bound to give you problems as Excel is a desktop app and not suitable for automation in a multi-threaded environment.
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