You can refer to .NET examples for DataScope Select 12.0 SOAP API from here. It contains the EndOfDaySample and TermsAndConditionsSample. You also need to refer to the DATA CONTENT GUIDE FOR DATASCOPE SELECT 12.3 for definitions of all of the data fields available in DataScope Select.
@sree.harsha For C#, we provide a .NET SDK and also an example application which is interactive and quite comprehensive. Using SDK will be considerably easier than using SOAP API which is not supported and its REST API now.
To get SDK and Example Application, Login to the Datascope Web GUI and Select Help -> Rest API Help and download from SDK menu at the top.
The example application allows trying out various API endpoints (which you are permissioned for), and also the sample C# code to implement that API function.