List only 2 columns

Change your wuery as below:

var Result = ( from t in EmpList   where t.IsActive == true   select new View_Header { t.column1, t.column1 }).ToList();  

public List GetList()   {       

var Result = (from t in context.View_Headers                   

where t.IsActive == true                   

select new View_Header                             

{                                      

First_Column =  t.column1,                                     

Second_Column = t.column2                                

}).ToList();       

return Result;  

}