Question

public void Submit1_Click(Object sender, EventArgs E)
{
    string strheadlinesid1 = string.Empty;

    if (!IsPostBack)
    {
        if (!string.IsNullOrEmpty(Convert.ToString(Request.QueryString["folder"].ToString())))
        {
            strheadlinesid1 = Request.QueryString["folder"].ToString();

        }
    }

    string URL = "view4.aspx?value="+strheadlinesid1;

    Response.Redirect(URL);
   }

This is a function I’m using but when I pass strheadlinesid1, “value” variable in URL is getting nothing.Why Is it happening.Is there any wrong in this approach.

Answer 1

On the button click, the page will be in the postback state and your condition will be false if (!IsPostBack) so it will not enter into the block and hence the value will not be assigned to strheadlinesid1

this block

if (!IsPostBack)
{
    if (!string.IsNullOrEmpty(Convert.ToString(Request.QueryString["folder"].ToString())))
    {
        strheadlinesid1 = Request.QueryString["folder"].ToString();

    }
}

should be

 if (!string.IsNullOrEmpty(Convert.ToString(Request.QueryString["folder"].ToString())))
    {
        strheadlinesid1 = Request.QueryString["folder"].ToString();

    }