Opening a file and enable dropdownlist on single click event of linkbutton

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ASP.NET

I want to open a file from given path and enable a dropdownlist on click event of linkbutton. But only file gets opened dropdownlist is not enabled.Both the controls are placed in a gridview. Have tried keeping the two task in function and then calling on clickevent, still didn't work. Even when i tried to display a popup and open a file on click event it didn't work.

protected void lnkvwReport_Click(object sender, EventArgs e)
{
LinkButton lnkvwReport = (LinkButton)sender;
GridViewRow row1 = (GridViewRow)lnkvwReport.Parent.Parent;
DropDownList ddlfeedback = ((DropDownList)row1.FindControl("ddlfeedback"));
ddlfeedback.Enabled = true; //DOESN'T WORK

//FILE OPENING PART - WORKS
string savepath="PATH_TO_FILE";
string filename=savepath+"Report";
Response.AddHeader("content-disposition","inline;filename=report");
Response.ContentType="application/vns.ms-excel";
Response.Flush();
Response.WriteFile(filename);
Response.End();

}