c# - Validation attribute depending on object instance type -

i'm facing conception problem. create , update our deals in 2 ways : using web forms (one create deals, 1 edit them) , through integration file (to allow mass creation & update).

public class createdealviewmodel {     public int dealid { get; set; }      [validatesalesman]     public int salesmanid { get; set; } }  public class editdealviewmodel {     public int dealid { get; set; }      [validatesalesman]     public int salesmanid { get; set; }  }  public class integrationline {     public int dealid { get; set; }      [validatesalesman]     public int salesmanid { get; set; }      public string status { get; set; } } 

i have validation logic implement : @ deal creation, active salesman accepted ; in update, active salesman plus previous salesman value (stored in db) accepted.

i wrote :

public class validatesalesman : validationattribute {     protected override validationresult isvalid(object value, validationcontext validationcontext)     {         var container = validationcontext.objectinstance;         if (container.gettype() == typeof(integrationline))         {             if(((integrationline)container).status == "creation")              {                 //validation logic here             }             else              {                  //validation logic here             }         }         else if(container.gettype() == typeof(createdealviewmodel))          {            //validation logic here         }          else if(container.gettype() == typeof(editdealviewmodel))          {            //validation logic here         }       }  } 

}

is approach (mvc compliant) or not ? validation attribute has know witch kind of model applies on ?

thanks in advance advice :)