problem with mySql-Connector .Net - 1.0.4 - parameter

[info]

hey guys,

i use c#, vs studio .net, mySql and the ByteFX-DataProvider so long. It works great, there are no problems. Now i would like to change my application using the new MySql-Connector for .Net ( 1.0.4 ), but there is a problem...

   MySqlParameter p1 = new MySqlParameter("@p1", MySqlDbType.Int32);
   MySqlParameter p2 = new MySqlParameter("@p2", MySqlDbType.String);
   p1.Value = adressID;
   p2.Value = comboBox1.SelectedText;
   myCmd.Parameters.Add(p1);
   myCmd.Parameters.Add(p2);
   myCmd.CommandText = "INSERT INTO mandant (AdressID, Waehrung) VALUES (@p1, @p2)";
   myCmd.ExecuteNonQuery();

So far, this code works great. Now i get the exception "AdressID cannot be null", but the p1.Value isn´t null...

Does anyone know why???

thx for any answer
jlo - germany