how to scroll grid to selectedindex.

int pageindex = -1;
int rowindex = -1;

for (int i = 0; i < grid_view.PageCount; i++)
       {
           grid_view.PageIndex = i;
           grid_view.DataSource = ds;
           grid_view.DataBind();
           foreach (GridViewRow row in grid_view.Rows)
           {
               //your search match condition
               // if match
               pageindex = i;
               rowindex = row.RowIndex;
               break;
           }
           if (pageindex > 0)
           {
               break;
           }
       }

       grid_view.PageIndex = pageindex;
       grid_view.DataSource = ds;
       grid_view.DataBind();

if(grid_view.PageIndex == pageindex)
 {
      if(e.Row.RowIndex == rowindex)
      {
          e.Row.BackColor = System.Drawing.Color.Red;
      }
 }