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private void DG_TO_Excel()
{
            Response.clear();
            Response.Buffer=true;
            Response.Charset="GB2312";
            Response.AppendHeader("content-Disposition","attachment;filename=FileName.xls");
            Response.contentEncoding=System.Text.Encoding.GetEncoding("GB2312");
            Response.ContentType="application/vnd.ms-excel";
//Response.ContentType="application/vnd.ms-word"; //导到word
            Response.Charset="";
            this.EnableViewState=false;
            System.Io.StringWriter str=new System.Io.StringWriter();
            System.Web.UI.HtmlTextWriter htw=new System.Web.UI.HtmlTextWriter(str);
//this.ClearControls(DataGrid1);
            DataGrid1.RenderControl(htw);
            Response.write(str.ToString());
            Response.End();
}

Private wid clearcontrols(control control)
{
for(int i=control.controls.Count-1; i>=0;i--)
{
clearControls(control.controls[i])
{
if(!(control is Tablecell))
{
if(control.GetType().Getproperty("SelectedItem")!=null)
Literalcontrol literal=new LiteralControl);
control.Parent.Controls.Add(literal);
try
{
literal.Text=(string)control.GetType().Getproperty("SelectedItem").GetValue(control.null);
}
catch
{
throw;
}
control.Parert.Controls.Remove(control);
}
else if(control.GetType().Getproperty("Text")!=null)
{
LiteralControl literal=new LiteralControl();
control.Parent.controls.Add(literal);
literal.Text=(string)control.GetTypel().Getproperty("Text").GetValue(control,null)
control.parent.Controls.Remove(control);
}
}
return;
}