I have developed a web application in visual studio 2008 which contains some reports iam getting the below error when i run my crystal reports kindly provide me a solution
Logon failed. Details: crdb_adoplus : Object reference not set to an instance of an object. Error in File C:\DOCUME~1\RAMAKR~1.NIT\LOCALS~1\Temp\vehtimelag {0375CEB7-60CA-4FF2-8E8F} kindly help me it is very urgent

Thanks in advance

iam connecting to an in-memory dataset here is the code for my report

namespace SCM
{
    public partial class timelag : System.Web.UI.Page
    {
        WS_UAA.AVLS_WS_UAASoapClient w = new WS_UAA.AVLS_WS_UAASoapClient();
        protected void Page_Load(object sender, EventArgs e)
        {
            
        }

        protected void crvvehicletimelag_Init(object sender, EventArgs e)
        {
           
        }

        protected void timelag_Init(object sender, EventArgs e)
        {
            WS_UAA.ReturnDR ret = default(WS_UAA.ReturnDR);

            ret = w.Selectt("SELECT ST_Vehicle_Reg_No,ST_Route_ID,convert(varchar, ST_Sch_Time, 100) as ST_Sch_Time,convert(varchar, ST_Actual_Start_Time, 100) as ST_Actual_Start_Time,ST_DATE from B_Vehicle_TimeLag where ST_DATE='" + Session["SD"] + "'", Session["Username"].ToString());

            vehtimelag rpt = new vehtimelag();
            //rpt.Load(Server.MapPath("vehtimelag.rpt"));

            rpt.SetDataSource(ret.Trigger_Return_Table);
            //rpt.SetDatabaseLogon("sa", "sa123$");




            //ReportObject crReportObject = default(ReportObject);
            TextObject crTextObject = default(TextObject);
            foreach (ReportObject crReportObject in rpt.Section1.ReportObjects)
            {
                if (crReportObject.Kind == ReportObjectKind.TextObject)
                {
                    crTextObject = (TextObject)crReportObject;
                    switch (crReportObject.Name)
                    {

                        case "tbvehtimelagrptdate":
                            crTextObject.Text = Convert.ToDateTime(Session["SD"]).ToString("dd-MMM-yyyy");
                            break;
                    }
                }
            }
            crvvehicletimelag.ReportSource = rpt;
            crvvehicletimelag.DataBind();
        }

    }
}

Iam not getting error in any line but after running the code me report is not getting displayed aim getting the following error
Logon failed. Details: crdb_adoplus : Object reference not set to an instance of an object. Error in File C:\DOCUME~1\RAMAKR~1.NIT\LOCALS~1\Temp\vehtimelag {0375CEB7-60CA-4FF2-8E8F}
kindly help me it is very urgent 

when i debug the code every line executes correctly but the report opens with the above error iam unable to find where the error is.

Another thing that I missed in your code - try changing this line:

Edited by hilfy - 20 Jan 2011 at 9:28am