ASP.NET Return inserted row id

EXTERNAL CLASS
 
public class TrainingModules
{
		private int tmID;
		private string strName_en;
		private string strName_el;
		private string strDesc_en;
        private string strDesc_el;
 
		public int ModuleID
		{
			get {return tmID;}
			set {tmID = value;}
		}
		public string Name_en
		{
			get {return strName_en;}
			set {strName_en = value;}
		}
		public string Name_el
		{
			get {return strName_el;}
			set {strName_el = value;}
		}
		public string Desc_en
		{
			get {return strDesc_en;}
			set {strDesc_en = value;}
		}
		public string Desc_el
		{
			get {return strDesc_el;}
			set {strDesc_el = value;}
		}
 
		public TrainingModules(string strName_en, string strName_el, string strDesc_en, string strDesc_el)
		{
			//this.tmID = tmID;
			this.strName_en = strName_en;
			this.strName_el = strName_el;
			this.strDesc_en = strDesc_en;
			this.strDesc_el = strDesc_el;
		}
 
        public TrainingModules() { }
 
 
    public string AddModule(TrainingModules tm)
    {
        SqlConnection myConnection = new SqlConnection(Configuration.DbConnectionString);
 
        SqlCommand cmd = new SqlCommand("AddTrainingModule", myConnection);
        cmd.CommandType = CommandType.StoredProcedure;
 
        cmd.Parameters.Add(new SqlParameter("@name_en", SqlDbType.NVarChar, 200));
        cmd.Parameters["@name_en"].Value = tm.Name_en;
        cmd.Parameters.Add(new SqlParameter("@name_el", SqlDbType.NVarChar, 200));
        cmd.Parameters["@name_el"].Value = tm.Name_el;
        cmd.Parameters.Add(new SqlParameter("@desc_en", SqlDbType.NVarChar, 1000));
        cmd.Parameters["@desc_en"].Value = tm.Desc_en;
        cmd.Parameters.Add(new SqlParameter("@desc_el", SqlDbType.NVarChar, 1000));
        cmd.Parameters["@desc_el"].Value = tm.Desc_el;
 
        cmd.Parameters.Add(new SqlParameter("@tm_ID", SqlDbType.Int));
        cmd.Parameters["@tm_ID"].Direction = ParameterDirection.Output;
 
        try
        {
            myConnection.Open();
            cmd.ExecuteNonQuery();
            return Convert.ToString(cmd.Parameters["@tm_ID"].Value);
        }
        catch (SqlException err)
        {
            throw new ApplicationException("Cannot add training module.");
        }
        finally
        {
            myConnection.Close();
        } 
    }
}
 
 
 
WEB FORM CODE BEHIND
        string strTrainingModuleId = db.AddModule(new TrainingModules(
            strName_en, strName_el, strDesc_en, strDesc_el));
 
        Response.Write(strTrainingModuleId);
 
STORED PROCEDURE
ALTER PROCEDURE dbo.AddTrainingModule
@name_en			nvarchar(200),
@name_el			nvarchar(200),
@desc_en			nvarchar(1000),
@desc_el			nvarchar(1000),
@tm_ID				int OUTPUT
 
AS
 
INSERT INTO dbo.tbl_trainingmodules
        (tm_Name_en, tm_Name_el, tm_Desc_en, tm_Desc_el) 
  VALUES 
        (@name_en, @name_el, @desc_en, @desc_el)
SET @tm_ID = @@IDENTITY
SELECT @tm_ID

                                              

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