Object reference not set to an instance of an object

Question

Hi, 

I'm getting this error while running following code. 

 

Server Error in '/' Application.

---

Object reference not set to an instance of an object.

private void CheckFriendshipStatus()

{

var obj1 = Session["UserId"].ToString();

var obj2 = Session["CurrentProfileId"].ToString();

if (obj1 == obj2)

{

btnAddAsFriend.Visible = false;

}

I also tried 

private void CheckFriendshipStatus()

{

if (Object.Equals(Session["UserId"].ToString(), Session["CurrentProfileId"].ToString()))

{

btnAddAsFriend.Visible = false;

}

 

I couldn't solve this please help me to solve this.