Issue with session value

Question

User105364981 posted

i have an aspx file where it is using usercontrol file.

on the dropdown selected index changed i am calling getdetails() method. where it calls data back from database and assing to controls

in the dropdown !=1 means which is already saved in database and now i am trying to populate the values back from the database to these controls.
if (ddldetails.SelectedIndex != 1)
                {
                   
                    GetDetails();
                    ((UC)ASPxNavBar1.Items[0].FindControl("ucEmployee")).FillData();
                    ((UpdatePanel)ASPxNavBar1.Items[0].FindControl("upPnlGridReq")).Update();

                }

The issue is that when i debug the code i am able to see values in getdetails() but when it goes to next method filldata on user control Session["CompleteList"] is null. looks like here we are assingned in a variable but in getdetails i am assigning directly is this the issue? thats why i am seeing the session as null in filldata method?

 void GetDetails()
        {
            DataTable dt = new DataTable();
            dt = blala(where we call database SP by passing params and puling data)

            for (int i = 0; i < dt.Rows.Count; i++)
            {

                if (dt.Rows[i]["ControlName"].ToString() == "ID")
                {
                    Session["ID"] = dt.Rows[i]["ControlValue"];
                }
                else if (dt.Rows[i]["ControlName"].ToString() == "IDName")
                {
                    Session["IDName"] = dt.Rows[i]["ControlValue"];
                }
}
}

usercontrol-
 public void FillData()
        {

              if ((Session["CompleteList"] != null))
            {
                var CompleteList = (List<KeyValuePair<string, string>>)Session["CompleteList"];

                foreach (KeyValuePair<string, string> completelist in CompleteList)
               

                    if ((txtID.Text.Trim() == string.Empty) && (completelist .Key.Contains("scWUID")))
                        txtID.Text = CompleteList.Value;

                    if ((txtEmpID.Text.Trim() == string.Empty) && (activitySearchList.Key.Contains("EmployeeID")))
                        txtEmpID.Text = CompleteList.Value;

Answer 1

User475983607 posted

There is no indication in the posted code where Session["CompleteList"] is populated or how it is used.  Use the Visual Studio "Find" feature to find where Session["CompleteList"] is assigned a value.  It could be it is never assigned a value or it is assigned later in the code.  This is one of the many hazards of using Session as a variable rather that a cache as intended.

This code block is might not functioning as expected.  Session["ID"] and  Session["IDName"] will always contain the last values from the last row.

for (int i = 0; i < dt.Rows.Count; i++)
{

	if (dt.Rows[i]["ControlName"].ToString() == "ID")
	{
		Session["ID"] = dt.Rows[i]["ControlValue"];
	}
	else if (dt.Rows[i]["ControlName"].ToString() == "IDName")
	{
		Session["IDName"] = dt.Rows[i]["ControlValue"];
	}
}