Export dataset to the excel sheet in asp.net c#

Question

I tried to export the dataset which have 4 tables to the excel sheet, Unfortunately I can't. I have code to export data table to excel. So instead of dataset, I called the "ExportToExcel" function which I have in my code to export datatable to excel 4 times. But once it created the first sheet, it stops the control flow. Control doesn't call the second function ("ExportToExcel(dsResult.Tables[2], "AthleteSentCount");") Here is the code

protected void ExportToExcel(object sender, EventArgs e)
{
     ExportToExcel(dsResult.Tables[3], "AthleteInboxCount");
     ExportToExcel(dsResult.Tables[2], "AthleteSentCount");
     ExportToExcel(dsResult.Tables[0], "CoachInboxCount");
     ExportToExcel(dsResult.Tables[1], "CoachSentCount");
}

void ExportToExcel(DataTable dt, string FileName)
{
    if (dt.Rows.Count > 0)
    {
        string filename = FileName + ".xls";
        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        DataGrid dgGrid = new DataGrid();
        dgGrid.DataSource = dt;
        dgGrid.DataBind();

        //Get the HTML for the control.
        dgGrid.RenderControl(hw);
        //Write the HTML back to the browser.
        //Response.ContentType = application/vnd.ms-excel;
        Response.ContentType = "application/vnd.ms-excel";
        Response.AppendHeader("Content-Disposition", 
                              "attachment; filename=" + filename + "");
        this.EnableViewState = false;
        Response.Write(tw.ToString());
        Response.End();
    }
}

If any body knows to export the dataset to the excel with the bar chart please help me. Else please give your solution to the problem.

Answer 1

First of all your function start streaming content

 Response.ContentType = "application/vnd.ms-excel";
                Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");

to end user and END it with

Response.End();

Moreover if you fix this your code will product 4 excel files.

There is an existing code for creating Excel sheets on stack overflow: How to add additional worksheets to an Excel from DataTable The only change you will have to made will be saving xlsx to stream and transmit this stream to user.