@ywdm varchar(10),

    @value varchar(20) output

AS

begin

    set @value=Select top 1 createt From table Where ywdm=@ywdm

end

var cmd = db.GetStoredProcCommand("Proc_GetInfo");

db.AddInParameter(cmd, "ywdm", DbType.String, mYzm.Ywdm);

db.AddOutParameter(cmd, "@value", DbType.String, 20);

db.ExecuteNonQuery(cmd);
return cmd.Parameters["@value"].Value.ToString();