C# - Store Procedure With IsIDenity And Cmd.Parameters.Add?

I am creating an ASP.NET Wiki for myself to track the knowlege I gain in C# and other language.

I have created a Stored Procedure to insert a category into a DB, the DB has two fields C_ID(int) and Category(varchar 25). In my ASP page, there is no field for C_ID, it increments automatically by IsIdentiy = true;

When I try to excute it, it fails. What is the best approach to handle this?

Code:

ALTER PROCEDURE dbo.InsertCategory
@ID int,
@CATEGORY varchar(25)
AS
INSERT INTO Wiki
(C_ID, C_Category)
Values (@ID, @CATEGORY)
/* SET NOCOUNT ON */
RETURN

Did I miss something to insert from the .aspx page?
try
{
//create a command object identifying the Stored Procedure
SqlCommand cmd = new SqlCommand("InsertCategory", conn);
//Set the command type
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("Category", txtAddCatagory));
cmd.ExecuteNonQuery();