String sql = "moveData";
mCMD = DB.GetStoredProcCommand(sql);
DB.AddInParameter(mCMD,"@State",DbType.Int32,2);
DB.AddParameter(mCMD, "@ret", DbType.Byte, ParameterDirection.ReturnValue,"",DataRowVersion.Default,null);

mCMD.Parameters["@ret"].Value

1.添加参数

public void AddParameter(DbCommand command, string name, DbType dbType, ParameterDirection direction, string sourceColumn, DataRowVersion sourceVersion, object value);

    DB.AddParameter(mCMD, "@return", DbType.Byte, ParameterDirection.ReturnValue,"",DataRowVersion.Default,null);

DB.AddParameter(mCMD, "@return", DbType.Byte, ParameterDirection.ReturnValue,NULL,DataRowVersion.Default,null);

说明：第二个为参数名必须为 @变量名 否则系统会自动添加

        ParameterDirection.ReturnValue    最关键指明去传回值

2.执行

    DB.ExecuteNonQuery(mCMD);

3.取值

  DbType.Byte x= mCMD.Parameters["@return"].Value;