datagridview属性框在Windows应用程序2008

Question

我遇到的问题是DataGridView1属性框在我们的Windows应用程序2008中显示为空白。 并且在另一个窗口中，datagridview1属性框显示为空白。 所以请告诉我解决这个问题。

                    string qryproceedip = "Select COUNT(ProceedIP)TotalIPCounts,convert(time(7), DateAdd(SECOND, SUM(DATEDIFF(SECOND,(worktime),(deletetime))),0),108) as actualtime " +
                    " from ipinfo where username='" + username.Trim() + "' and workdate='" + todaylogindate.Trim() + "'";
                   SqlCommand cmdip = new SqlCommand(qryproceedip, mycon);
                   mycon.Open();
                   SqlDataAdapter sdaip = new SqlDataAdapter(cmdip);
                   DataTable dtip = new DataTable();
                   sdaip.Fill(dtip);
                   dataGridView1.DataSource = dtip;
                   mycon.Close();
                   dtip.Clear();
                   tdt.Clear();

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