There is no row at position 0.

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Dear Coders,

Please Help,

The code is below. When executing it works fine. but when exiting the program the Following Error Occurs. "There is no row at position 0"
Please Help.

VB

Private Sub Mat_Sub_NoComboBox_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Mat_Sub_NoComboBox.SelectedIndexChanged

    TextBox1.Text = Mat_Sub_NoComboBox.SelectedValue

    con.ConnectionString = myconstring

    'Fetch Project_id to textbox
    Dim Prjda As New SqlDataAdapter("SELECT trade FROM Mat_e1_prj where mat_sub_no='" + Mat_Sub_NoComboBox.SelectedValue + "'", con)
    Dim Prjdt As New DataTable
    Prjda.Fill(Prjdt)
    Project_IDTextBox.Text = Prjdt.Rows(0).Item("Trade")

Posted 18-Nov-12 2:08am

armarzook

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OriginalGriff · Accepted Answer · 2012-11-18T02:22:00

Solution 1

As I said to your last question: your query returns no rows.
You need to check the DataTable.Rows.Count property before you try to access the returned values.

Posted 18-Nov-12 2:22am

OriginalGriff

Comments

armarzook 18-Nov-12 8:58am

Already tried it by passing the code into a msgbox
the actual output is 1. This is why iam confused.

OriginalGriff 18-Nov-12 9:01am

And do you get a "1" when you get the error? I don't think you do...

armarzook 18-Nov-12 9:07am

FYI

1) http://tinypic.com/r/34xrfdg/6
2) http://tinypic.com/r/v48co9/6
3) http://tinypic.com/r/2ccm5oy/6

and i actually get the error when exiting the program.

OriginalGriff 18-Nov-12 9:16am

Yes - and looking at your code, you show the message box after you have accessed the row and it has excepted (see your pic 3)
That means that there are no rows - which means that the SELECT is returning none, which means that there are no rows where mat_sub_no in the DB matches teh current contents of Mat_Sub_NoComboBox.SelectedValue
So, when you get the exception - use the debugger to look at the other variables.
What is the value of Mat_Sub_NoComboBox.SelectedValue? Just hover your mouse over it and it will tell you...And I'm just guessing "Nothing" here! :laugh:

armarzook 18-Nov-12 9:42am

So. Whats the solution???

OriginalGriff 18-Nov-12 9:49am

Check first.
Check your SelectedValue is ok.
Check your Rows.Count.
Do not try to get a value from a row if it isn't going to exist!

armarzook · Accepted Answer · 2012-11-20T02:27:00

Solution 2

Just Added then it worked... Anyways thanks for your support coders.

VB

If dt.rows.count > 0 then
Project_IDTextBox.Text = Prjdt.Rows(0).Item("Trade")
End If

Posted 20-Nov-12 2:27am

armarzook

Updated 20-Nov-12 3:25am

v2