https://community.esri.com/t5/arcobjects-sdk-questions/null-reference-exception-on-connection-open/m-p/1035141#M20277 <P>Hi,</P><P>&nbsp;</P><P>I am working on ArcObjects using Visual Studio 2015.&nbsp; I am connecting 'sql server' connection and getting System.NullREferenceExpceiotn occureed in MyToolbox.dll. I am using ArcMap 10.6.1.</P><P>&nbsp;</P><P>Here are steps</P><P>1. Added App.config&nbsp;</P><P>&lt;add name="SQLserver" connectionString="server=xxx;database=xxx;User Id=xxx;Password=xxx"/&gt;</P><P>2.&nbsp; Button.vb file</P><P><BR />Dim SqlDB As Object = ConfigurationManager.ConnectionStrings("SQLserver").ConnectionString</P><P>&nbsp;</P> Wed, 10 Mar 2021 20:53:44 GMT rajujee 2021-03-10T20:53:44Z https://community.esri.com/t5/arcobjects-sdk-questions/null-reference-exception-on-connection-open/m-p/1035141#M20277 <P>Hi,</P><P>&nbsp;</P><P>I am working on ArcObjects using Visual Studio 2015.&nbsp; I am connecting 'sql server' connection and getting System.NullREferenceExpceiotn occureed in MyToolbox.dll. I am using ArcMap 10.6.1.</P><P>&nbsp;</P><P>Here are steps</P><P>1. Added App.config&nbsp;</P><P>&lt;add name="SQLserver" connectionString="server=xxx;database=xxx;User Id=xxx;Password=xxx"/&gt;</P><P>2.&nbsp; Button.vb file</P><P><BR />Dim SqlDB As Object = ConfigurationManager.ConnectionStrings("SQLserver").ConnectionString</P><P>&nbsp;</P> Wed, 10 Mar 2021 20:53:44 GMT https://community.esri.com/t5/arcobjects-sdk-questions/null-reference-exception-on-connection-open/m-p/1035141#M20277 rajujee 2021-03-10T20:53:44Z