progress bar

Question

Want to display staus of long process.
when user click on button calling some function which will return the percentage of work done .I want to display that persentage in
some where in the page.How can i do it?

private void ImgButtonadd_Click(object sender, System.Web.UI.ImageClickEventArgs e)
        {
int persentdone=0;
   for (int iRow = 0; iRow < Rows; iRow++)
            {
  persentdone=getworkprocess(file(iRow));
  }
 }
i want to display this persentdone in my page somewhere.