error : object reference not set to an instance of an object

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error : object reference not set to an instance of an object...can anyone help me .thanks in advance

VB

Dim da As New SqlClient.SqlDataAdapter("select job_no from offsale.jobdetails (nolock) where location='" & Session("frmlogin_var_area") & "'", mycon)

 Dim ds As New DataSet

 da.Fill(ds)

 mycon1.Close()
 da.Dispose()
 'jobno.Items.Add("Select")
 If ds.Tables(0).Rows.Count > 0 Then
     'txtjobno1.Text = ds.Tables(0).Rows(0).Item(0) & " "
     For i = 0 To (ds.Tables(0).Rows.Count - 1)
         'jobno.Items.Add(ds.Tables(0).Rows(i).Item(0))

         DropDownList1.Items.Add(ds.Tables(0).Rows(i).Item(0))

     Next
 End If
 ds.Dispose()

Posted 16-Nov-12 19:22pm

nityasri

Updated 16-Nov-12 19:40pm

ridoy

v2

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[no name] 17-Nov-12 2:02am

for which object you are getting such error (i.e DataAdapter or Datset) ?

nityasri 17-Nov-12 2:23am

@krunal....in dataset i am getting error...

OriginalGriff 17-Nov-12 2:31am

Which line is the error occurring on?

nityasri 17-Nov-12 2:34am

DropDownList1.Items.Add(ds.Tables(0).Rows(i).Item(0))

nityasri 17-Nov-12 2:36am

@original griff...we are using it in a mobile web application...

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Dave Kreskowiak · Answer 1 · 2012-11-17T09:36:00

Your code is assuming that the DataSet you created and Filled has tables and rows in it.

Either your DataSet doesn't have tables and Table(0) is returning null (Nothing in VB.NET) or the table does exist and Rows(i) is returning null, or Rows(i) is returning a row with no columns.

Only you can figure out which by using the debugger to inspect that line of code when the exception is thrown.