Question

Like for a single value i easily work, or also true false condition.
like getting a single value from database

                    string i = "";
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.CommandText = "SelectPass";
                    cmd.Parameters.AddWithValue("@userID", context.Request.QueryString["id"]);
                    conn.Open();
                    SqlDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        i = reader["Password"].ToString();
                    }
                    reader.Close();
                    conn.Close();
                    if (i == "")
                    { context.Response.Write("False"); }
                    else
                    {
                        context.Response.Write(i);
                    }

and in client side easily showing the value in one variable.

 function abc()
{   
    $.get('\HandlerResetPass.ashx?id=' + $('#txtUserId').val()+'&lbl='+ $('#lblPasswo').val(), callback);
    function callback(data)
    {

    if (data == "False")
    {
    alert('ID doesn\'t exist try again..!')
    return false;
    }
    else 
    {
    $('#tblPassWord').show();
    $('#tblprofile').hide();
    role = data;
    }
    }
}

But how working with A dataset.

Answer 1

we can return data set from handler by useing that king of work.

   public void ProcessRequest(HttpContext context)
    {
        string connect = (@"Connection string");

        using (SqlConnection conn = new SqlConnection(connect))
        {
            using (SqlCommand cmd = new SqlCommand("", conn))
            {
                string i = "";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "Selecttest";
                cmd.Parameters.AddWithValue("@_ID", context.Request.QueryString["id"]);
                conn.Open();
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                DataSet ds = new DataSet();
                da.Fill(ds);
                conn.Close();
                string ans = "";
                ans = Convert.ToString(ds.Tables[0].Rows[0]["name"])+",";
                ans += Convert.ToString(ds.Tables[0].Rows[0]["age"]);
                context.Response.Write(ans);
            }
        }
    }

Or in client side we get these two values by this method.

 function abc()
{
$.get('\Handler1.ashx?id=' + $('#txtID').val(), callback);
 function callback(data)
 {

    var arr = data.split(',');  
    $("#name").html(arr[0]);   
    $("#age").html(arr[1]);  
 }  
}