构造DataTable

手动构造一个DataTable：

                 DataTable dt = new DataTable();
                 dt.Columns.Add("ID", typeof(string));
                 dt.Columns.Add("Name", typeof(string));
                 DataRow _Row1 = dt.NewRow();
                 _Row1["ID"] = "";
                 _Row1["Name"] = "男";
                 dt.Rows.Add(_Row1);
                 DataRow _Row2 = dt.NewRow();
                 _Row2["ID"] = "";
                 _Row2["Name"] = "女";
                 dt.Rows.Add(_Row2);
                 comboBox1.DisplayMember = "Name";
                 comboBox1.ValueMember = "ID";
                 comboBox1.DataSource = dt;