If Condition not working correctly in C#.net?

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C#

Hi,

I am very struggle this problem, please see two file in <completed> tag

i want output,completed value=0 condition OK, otherwise Treatment Aborted...

please kindly help me..

XML file 1

<start></start>
<?xml version='1.0'>
<pit>
<vol>100</vol>
<hct>1.0</hct>
<joule>8.82</joule>
<jouleend>0.00</jouleend>
<complete>0</complete>
<runt ime>6.42</runt ime>
<pauset ime>0.00</pauset ime>
<nrpause>00</nrpause>
<temparature<27.5</temperature>
</pit>

XML file 2

<start></start>
<?xml version='1.0'>
<pit>
<vol>100</vol>
<hct>1.0</hct>
<joule>8.82</joule>
<jouleend>0.00</jouleend>
<complete></complete>
<runt ime>6.42</runt ime>
<pauset ime>0.00</pauset ime>
<nrpause>00</nrpause>
<temparature<27.5</temperature>
</pit>

case "complete":
             if (reader.Read())
                 {
                   if (reader.Value==null)
                    {
                     ProcedureCompletedTextBox.Text = "Treatment Aborted";
                     csvData.Append("Treatment Aborted" + ";");
                     }
                     else
                     {
                     ProcedureCompletedTextBox.Text = "OK";
                     csvData.Append("OK" + ";");
                     }
                 }

Thanks in Advance