"RegisterForEventValidation can only be called during Render();"

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Iam getting this error while transferring data from gridview to excel, can any one suggest me the solution"RegisterForEventValidation can only be called during Render();"

I got a solution that i should do EnableEventValidation=false and generate the event VerifyRenderingInServerForm(Control control) in my code...i did this too..
now i am not getting any error...but excel file is not getting generated..help...

Posted 30-Dec-12 21:41pm

nileshpujari

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bbirajdar 31-Dec-12 3:43am

And the question is ?

nileshpujari 31-Dec-12 4:01am

aspnet_regiis..
my question is that why my excel file not getting generated...

WajihaAhmed 31-Dec-12 3:55am

It would be helpful if you provide your code.

nileshpujari 31-Dec-12 4:00am

The following is my code....

protected void btngenexcel_Click(object sender, EventArgs e)
{
ExportXls(grdMails,"MailsData");
grdMails.DataSource = null;
grdMails.DataBind();
modalShowMails.Hide();
}

public static void ExportXls(GridView gridName, string filename)
{
string attachment = "attachment; filename=" + filename + ".xls";
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.AddHeader("content-disposition", attachment);
HttpContext.Current.Response.ContentType = "application/ms-excel";
StringWriter sWriter = new StringWriter();

HtmlTextWriter htwWriter = new HtmlTextWriter(sWriter);

gridName.RenderControl(htwWriter);
HttpContext.Current.Response.Write(sWriter.ToString());
HttpContext.Current.Response.End();

}

}

nileshpujari 31-Dec-12 4:09am

WajihAhmed... r u der...??

WajihaAhmed 31-Dec-12 4:14am

Yes :)

nileshpujari 31-Dec-12 4:25am

hey dude...that problem is solved..but another one has arisen...excel file is getting generated...but i have used paging while showing the data that i wanted to export in excel...so the problem is the entire data is not comin in excel..instead only the first data is cumin...wat mite b the prob..

nileshpujari 31-Dec-12 3:59am

The following is my code....

protected void btngenexcel_Click(object sender, EventArgs e)
{
ExportXls(grdMails,"MailsData");
grdMails.DataSource = null;
grdMails.DataBind();
modalShowMails.Hide();
}

public static void ExportXls(GridView gridName, string filename)
{
string attachment = "attachment; filename=" + filename + ".xls";
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.AddHeader("content-disposition", attachment);
HttpContext.Current.Response.ContentType = "application/ms-excel";
StringWriter sWriter = new StringWriter();

HtmlTextWriter htwWriter = new HtmlTextWriter(sWriter);

gridName.RenderControl(htwWriter);
HttpContext.Current.Response.Write(sWriter.ToString());
HttpContext.Current.Response.End();

}

}

nileshpujari 31-Dec-12 4:00am

aspnet_regiis..
my question is that why my excel file not getting generated...

bbirajdar 31-Dec-12 4:12am

remove "HttpContext.Current.Response.End();" from your code

nileshpujari 31-Dec-12 4:26am

hey my that problem is solved..but another one has arisen...excel file is getting generated...but i have used paging while showing the data that i wanted to export in excel...so the problem is the entire data is not comin in excel..instead only the first data is cumin...wat mite b the prob..

bbirajdar 31-Dec-12 4:44am

Tell us how the problem was solved and which solution worked for you.....You need to export the datatable instead of the gridview....

nileshpujari 31-Dec-12 5:13am

yup u r rite...dat was also solved using datatable.... and the previos prob was solved in foll way...
the button that was supposd ti generate excel file that button should be taken in <Triggers> tab and in that <asp:Postbacktrigger>...
thanx...

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WajihaAhmed · Answer 1 · 2012-12-30T22:39:00

Solution 2

I had once done this with some help from here:

http://stackoverflow.com/questions/8908363/exporting-gridview-to-xls-paging-issue[^]

See if that helps you too :) Looking forward for your comments.

Posted 30-Dec-12 22:39pm

WajihaAhmed

Updated 30-Dec-12 22:40pm

v2

nileshpujari · Answer 2 · 2012-12-30T23:20:00

The button that is supposd to generate the excel file..;place that button in the <asp:postbacktrigger xmlns:asp="#unknown"> tab of the <triggers> tab...
and if ur grid is doing paging then while exporting the data into excel use the Datatable instead of using the gridview coz if u use gridview then it will not generate proper excel file...
or u can do this..while generatin excel again get the data from the DB...