課堂回顧

         DataTable dt = new DataTable();
        DataColumn dc = new DataColumn();
        dc.ColumnName = "id";
        dc.DataType = typeof(int);  //Type.GetType("System.Int32");
        dc.AllowDBNull = false;
        dc.AutoIncrement = true;
        dc.AutoIncrementSeed = 1;
        dc.AutoIncrementStep = 1;
        dt.Columns.Add(dc);
        dc = new DataColumn();
        dc.ColumnName = "name";
        dc.DataType = typeof(string);
        dc.AllowDBNull = false;
        dt.Columns.Add(dc);
        DataRow row = dt.NewRow();
        row["name"] = "zhangsan";
        dt.Rows.Add(row);
        this.DropDownList1.DataSource = dt;
        this.DropDownList1.DataTextField = "name";
        this.DropDownList1.DataValueField = "id";
        this.DropDownList1.DataBind();