Error while updating data

Question

HI Everyone!!i have a problem in updating data...plz help me....

 

This is my SQl Query and i m using sql server R2 and  Visual Studio 2012(MVC 4)

 **update tbl_Showroom set (Showroom_Name,Contact_No,Email_Id,Contact_Person) VALUES ('{1}','{2}','{3}','{4}') where Showroom_Code = " + "'{0}'";

This is error i m getting 

 **Index (zero based) must be greater than or equal to zero and less than the size of the argument list.