C# .NET - Object type parameter gets converted to another type

  public static int AddmastrContent(Setting_Master obj_Entity)
    {
      Master_general_provider obj_prov = new Master_general_provider();
      return obj_prov.AddNew(obj_Entity);
    }

--------------

    Setting_Master _enty_sett = new Setting_Master();
    public int AddNew(object objInfo)
    {
      _enty_sett = (Setting_Master)objInfo;
      
      string val;

      val = "1";

      return Convert.ToInt32(val);    
      
    }

-----------------------


here in above code Setting_Master is a class ---- 
first function calls next function -- > AddNew(object objInfo)
here the parameter is object type ,

but what happens in below code : 

 _enty_sett = (Setting_Master)objInfo; 


is this any oops concept ? 

Object is the base type. When you send a Setting_Master as Object, it loses its specific type. 

And then as this is a reference type, you are using an "Explict Cast" to convert from the base type to the specific type (Setting_Master).