Hi,

Actually you do not need to set the URL before doing login, actually this URL acts as a endpoint URL of our http request in the connection established

This is basically returned after doing the login (i.e loginResult =conn.login(usrname,password)). you can see that by printing that in system debug.

After doing the Login you now need to set them. As follows

   conn.endpoint_x =loginResult.ServerUrl;

Now you can access the connection variable conn, to do query and create .

Use the below code as reference

=================IN Salesforce===============================================

   partnerSoapSforceCom.soap conn= new partnerSoapSforceCom.soap();

            conn.SessionHeader = new partnerSoapSforceCom.SessionHeader_element ();

            partnerSoapSforceCom.LoginResult loginResult = new partnerSoapSforceCom.LoginResult();

            partnerSoapSforceCom.LoginScopeHeader_element ls=new partnerSoapSforceCom.LoginScopeHeader_element();

          //  ls.portalId='00D60000000bvVs';

            ls.portalId='060800000000sdR';

            ls.organizationId='00D9000000dfvVp';

            conn.LoginScopeHeader=ls;

            loginResult =conn.login(usrname,password);

            conn.endpoint_x =loginResult.ServerUrl;

            conn.Sessionheader.sessionid = loginResult.sessionid;

    system.debug('____________Login Successful_______________________'+loginResult);

            system.debug('_______________Session__ID_________________________'+conn.Sessionheader.sessionid);

            system.debug('___________conn.endpoint_x_____________________'+conn.endpoint_x);

        List<sobjectPartnerSoapSforceCom.sObject_x> ConObjects=new List<sobjectPartnerSoapSforceCom.sObject_x>();

        sobjectPartnerSoapSforceCom.sObject_x c1;

        for(Contact con:ct)

        {

        c1=new sobjectPartnerSoapSforceCom.sObject_x();

        c1.type_x='Contact_Clone__c';

        c1.Name=con.FirstName;

        c1.LastName=con.LastName;

        c1.Email=con.Email;

        c1.Languages=con.Languages__c;

      //  c1.Code='Helloo';

      //  sobjectPartnerSoapSforceCom.sObject_x[] ConObjects=new sobjectPartnerSoapSforceCom.sObject_x[]{c1};

        ConObjects.add(c1);

        }

        partnerSoapSforceCom.SaveResult[] lsr=conn.create(ConObjects);

======================IN DOT NET================================================

   Partner.SforceService sf = new SforceService();

            Partner.LoginScopeHeader lh = new LoginScopeHeader();

            lh.portalId = "060800000000sdR";

            lh.organizationId = "00D9000000dfvVp";

            sf.LoginScopeHeaderValue = lh;

            Partner.LoginResult lr = new Partner.LoginResult();

            lr = sf.login(username, password);

            sf.Url = lr.serverUrl;

            //  sf.SessionHeaderValue.sessionId = lr.sessionId;

            SessionHeader sh = new SessionHeader();

            sh.sessionId = lr.sessionId;

            sf.SessionHeaderValue = sh;

            session = lr.sessionId;

            Response.Write(" Login Successsful <br/>" );

            blnCheck1 = true;

            // string strQuery = "select id, Title, Description, FileType from ContentVersion";

            // string strQuery = "select id from OAuth2_0__c";

            string strQuery = "Select Id, Name,TagModel from ContentWorkspace";

            QueryResult qr = sf.query(strQuery);

Did this answer your question? If not, let me know what didn't work, or if so, please mark it solved.