Hi Suman,<br><br>I suspect <font style="color: rgb(255, 0, 0);" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”]</span></font> evaluates to null in your case, and therefore the ToString() operation on the null reference is failing which problem is not related to the MapScript library itself.<br>
<br>Best regards,<br><br>Tamas<br><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font><br><br><div class="gmail_quote">2009/7/8 Suman Chatterjee <span dir="ltr"><<a href="mailto:schatterjee@addisontx.gov">schatterjee@addisontx.gov</a>></span><br>
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<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Hi all,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I am trying to develop an application in C# (VS2005) with mapscript.
I saw the material of Paolo. But I am facing a problem </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">In the line </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">mapObj map= new mapObj(System.Configuration.ConfigurationManager.AppSettings[“C:/ms4w/Apache/htdocs/mapservertest/Addison.map”].toString())</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">It is generating the error “ Object reference not set
to an instance of an object”</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">How can I correct this? If anyone helps me in correcting it,
it will be great.</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Suman</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
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