Export to excel is not working

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i'm having a list of data into "Custlist" but whenever i want to save it into a excel file, got an error "unable to evaluate expression because the code is optimized or a native frame is on top of the call stack".. is there anything to write in web.config file????

List<clscustexcel> Custlist = new List<clscustexcel>();
Custlist = obj.Fetch_CustomerManagementForExcel();
if (Custlist.Count > 0)
{
string filename = "Customer.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 = Custlist;
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.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
this.EnableViewState = false;
Response.Write(tw.ToString());
Response.End();
}

Posted 14-Sep-13 22:39pm

prthghosh999

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MCY · Answer 1 · 2013-09-14T23:40:00

Solution 1

An error like this occurs most of the time when you are trying to redirect to a new page, while the current page is still trying to complete it's process. You can find more information about the issue right here:
http://support.microsoft.com/kb/312629/EN-US/
Your call of

C#

Response.End()

possibly causes a threadAbortionException.
Adding few lines like these may help:

C#

HttpContext.Current.ApplicationInstance.CompleteRequest();
Response.Redirect ("myexamplepage.aspx", false);

Posted 14-Sep-13 23:40pm

MCY

Comments

prthghosh999 15-Sep-13 6:55am

i've written
HttpContext.Current..
instead of Response.End() and exception is not thrown..
but i'm not getting the excel file also

prthghosh999 15-Sep-13 6:55am

i've written
HttpContext.Current..
instead of Response.End() and exception is not thrown..
but i'm not getting the excel file also

MCY 15-Sep-13 15:23pm

I see. maybe debugging and tracing line by line helps to find why no excel is created?

Neema Derakhshan · Answer 2 · 2013-09-15T00:02:00

some years ago i did it with datatable,hope to help you

C#

public void ToExcel(DataTable dt, string reportName)
    {
        if (dt.Rows.Count > 0)
        {
            string filename = string.Format("{0}.xls", reportName);
            System.IO.StringWriter sw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
            HtmlForm hf = new HtmlForm();

            DataGrid dg = new DataGrid();

            dg.DataSource = dt;
            dg.HeaderStyle.BackColor = Color.Tomato;
            dg.HeaderStyle.ForeColor = Color.White;
            dg.BackColor = Color.LightGoldenrodYellow;
            dg.AlternatingItemStyle.BackColor = Color.PaleGoldenrod;
            dg.Font.Name = "Tahoma";
            dg.Font.Size = 10;
            dg.DataBind();

            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");

            HttpContext.Current.Response.Charset = "";
            EnableViewState = false;
            Controls.Add(hf);
            hf.Controls.Add(dg);
            hf.RenderControl(htw);
            HttpContext.Current.Response.Write(sw.ToString());
            HttpContext.Current.Response.End();
        }
    }