asp.net export to excel - asp.net

Question

Hello i got 2 pages with exporting to excel , i use something like this :
Response.ClearContent()
Response.Buffer = True
Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", "poView.xls"))
Response.ContentEncoding = Encoding.UTF8
Response.ContentType = "application/ms-excel"
Dim tw As New IO.StringWriter()
Dim htw As New HtmlTextWriter(tw)
budgetPlanGrid.RenderControl(htw)
Response.Write(tw.ToString())
Response.[End]()
Now i do manage to export into excel and see the needed grid, but on the more complex page which has alot more stuff in it for some reason beside the gridview i see parts from my masterpage! and it yells at me that i am missing the path for my style.css which has nothing to do with the gridview i am trying to export!.
I used 2 panels to make everything up untill / from the gridview visible = false,
I am kinda clueless what else could have caused that.
I am hoping maybe someone had this sort of issue while using this code and can advice me on what to look for?
Thanks in advanced!

Answer 1

I had that issue using RenderControl - kept asking for missing style sheets and other nonsense.
I used the datatable I would have used to bind the gridview and did this:
HttpContext.Current.Response.Clear();
HttpContacts.Current.Response.AddHeader("content-disposition", attachment):
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
string sTab = "";
foreach (DataColumn dc in dt.Columns)
{
HttpContext.Current.Response.Write(sTab + dc.ColumnName);
sTab = "\t";
}
HttpContext.Current.Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
sTab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
HttpContext.Current.Response.Write(sTab + dr[i].ToString());
sTab = "\t";
}
HttpContext.Current.Response.Write("\n");
}
HttpContext.Current.Response.End();