title: How to pass multiple parameters using Querystring in asp.net?
body: <pre><code>protected void btnBack_Click(object sender, EventArgs e)
  {
      if (!string.IsNullOrWhiteSpace(Request.QueryString["id"]))
      {
          int id = Convert.ToInt32(Request.QueryString["id"]);
          if (custTotle == 0)
          {
              Response.Redirect(prevPage);
          }
          else
          {
              Response.Redirect("~/Pages/Product.aspx?id=" + id + "Customize=" + custTotle);
          }
      }
  
  }
  </code></pre>
  
  <p>In this I want to pass two different values to the page but it is not redirecting and I get the error </p>
  
  <p>"<strong>Input string was not in a correct format.</strong>" </p>
  
  <p>at <code>id = Convert.ToInt32(Request.QueryString["id"]);</code></p>
  
  <p>Any suggestion?</p>