How to get return value from SQL stored procedure?

ALTER PROCEDURE mat.CheckRequestStatus

	@RequestFrom VARCHAR(64),
	@RequestTo VARCHAR(64),
	@RequestType INTEGER,
	
AS
BEGIN
		DECLARE @RequestStatus INTEGER				
		SET  @RequestStatus=(SELECT ISNULL((SELECT DISTINCT RequestStatus FROM tblRequest WHERE RequestFrom=@RequestFrom AND @RequestTo=@RequestTo), 0))
		
		IF( @RequestStatus=0)
		BEGIN
		SET  @RequestStatus=0
		RETURN @RequestStatus
		END
		
		RETURN @RequestStatus					
END

public int CheckRequestStatus(string RequestFrom, string RequestTo,int RequestType)
        {
            /* function CheckInterestReuest Returns a value
             * '0' for Request Not Exist
             * '1' for Pending Request
             * '2' for Accepet
             * '3' for Reject
             */

            int RequestStatus = 0;

            try
            {
                if (sqlcon.State == ConnectionState.Closed)
                {
                    sqlcon.Open();
                }

                SqlCommand cmd = new SqlCommand("mat.CheckRequestStatus", sqlcon);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@RequestFrom", RequestFrom);
                cmd.Parameters.AddWithValue("@RequestTo", RequestTo);
                cmd.Parameters.AddWithValue("@RequestType", RequestType);

                SqlParameter RuturnValue = new SqlParameter("@RequestStatus", SqlDbType.Int);
                RuturnValue.Direction = ParameterDirection.Output;
                cmd.Parameters.Add(RuturnValue);
                cmd.ExecuteNonQuery();
                RequestStatus = (int)cmd.Parameters["@RequestStatus"].Value;
            }
            catch
            {

            }
            finally
            {
                sqlcon.Close();
            }

            return RequestStatus;
        }