.net - How to combine lists into single data entity in c# -

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i have web method in c# web service creates 3 lists, filled xml input. want combine these 3 lists 1 entity (a dataset best, ios app consuming web service programmed accept , parse datasets), , return them web method.

here code looks like:

[webmethod] public dataset selectobjects(string externalid, string password) {      dataset ds = new dataset();       membershipauthservicereference.membershipauthenticationservice objservice = new membershipauthservicereference.membershipauthenticationservice();      membershipauthservicereference.soapheadercredentials objsoapheader = new membershipauthservicereference.soapheadercredentials();      membershipauthservicereference.memberuserinfo objmemberinfo = new membershipauthservicereference.memberuserinfo();       try      {          objsoapheader.username = externalid;          objsoapheader.password = password;           objmemberinfo = objservice.getmembershipinfo();           list<obj1> listobj1 = new list<obj1>();           (int = 0; < objmemberinfo.obj1.length; i++)          {              obj1 obj_obj1 = new obj1();              obj_obj1.stuff = objmemberinfo.obj1[i].stuff.tostring();              listobj1.add(obj_obj1);          }           list<obj2> listobj2 = new list<obj2>();           (int = 0; < objmemberinfo.obj2.length; i++)          {              obj2 obj_obj2 = new obj2();              obj_obj2.stuff = objmemberinfo.obj2[i].stuff.tostring();              listobj2.add(obj_obj2);          }           list<obj3> listobj3 = new list<obj3>();           (int = 0; < objmemberinfo.obj3.length; i++)          {              obj3 obj_obj3 = new obj3();              obj_obj3.stuff = objmemberinfo.obj3[i].stuff.tostring();              listobj3.add(obj_obj3);          }       }      catch (exception ex)      {          string serror;          serror = ex.message.tostring();      }      return ds;  }

how combine these lists dataset? i'm assuming it's possible? if not, there viable alternative same thing?

first concatenate lists shown below , use link generate dataset

 var combinedlist= listobj1.concat(listobj2).concat(listobj3);

how transform list<t> dataset?


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