An exception of type 'system.nullreferenceexception' occurred in online.dll but was not handled in user code

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System.NullReferenceException

An exception of type 'System.NullReferenceException' occurred in Online.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object.

What I have tried:

This Is My Code
How to Fix It

protected void Page_Load(object sender, EventArgs e)
        {
            if (Page.IsPostBack == false)
            {
                CDT = Cadapter.SELECT_SEARCH_COMPANY(Session["CCate"].ToString(), Session["CQuali"].ToString(), Session["CSkill"].ToString());
                if (CDT.Rows.Count == 0)
                {
                    lblmsg.Text = "Result not Found !!!";
                }
                else
                {
                    DataList3.DataSource = CDT;
                    DataList3.DataBind();
                }
            }

Posted 16-Jun-17 5:17am

sommr0

Updated 16-Jun-17 5:31am

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F-ES Sitecore · Accepted Answer · 2017-06-16T05:31:00

Something in your code is resolving to a "null" and you are trying to access a property on it. We can't tell you what that is as we can't run your code, you'll need to use the debugger to find out what. It could be "Cadapter", or Session["CCats"], or Session["CQuali"] and so on.

Once you've found out what is null then how you solve it depends on what you want to do in that situation, which again we can't know, but it's going to involve code like

if (XYX == null}
{
   // take the appropriate action
}

This question is asked multiple times a day, google the error for many articles discussing this, please do your own basic research before asking a question.