Redirect to any website on gridview button click in ASP.Net

This way

            Button b = (Button)sender;
                GridViewRow row = (GridViewRow)b.NamingContainer;
                if (row != null)
                {
                  if (row.Cells[1].Text == "External")
                  {
                     Response.Redirect(row.Cells[1].Text);
                  }else
                  {
                    //Get the Row Index
                    int rowIndex = row.RowIndex;
                    //Get the DataKey value
                    Response.Write("<script>");
                    string key = GridView1.DataKeys[rowIndex].Value.ToString();
                    var newurl = "CameraIdDetailedView.aspx?cameraid=" + key;
                    Response.Write("window.open('" + newurl + "',null,'height=600px,width=600px,status=0,toolbar=0,menubar=0,location=0')");
                    Response.Write("</script>");
                   }
 
                }