关于sqldataadapter:这个是asp.net2.0(C#)的bug吗?还请大侠赐教

string sConnectionString = ConfigurationManager.ConnectionStrings["phonebook"].ToString();
SqlConnection sqlconn = new SqlConnection(sConnectionString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = sqlconn;
cmd.CommandText = "PRO_GETDEPARTNAME";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Clear();
SqlParameter paraCompanyName = cmd.Parameters.Add("@companyname", SqlDbType.NChar);
paraCompanyName.Direction = ParameterDirection.Input;
paraCompanyName.Value = sCompanyName;
sqlconn.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "departTable");
return ds;
以上代码能正确运行.但修改成如下形式就出问题了:
str

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