//给DropDownList1添加项
…… …… //如果DropDownList1的Text和Value值一致 this.DropDownList1.SelectedIndex
= this.DropDownList1.Items.IndexOf(new ListItem(指定项)); //如果Text和Value值不一致 //指定Text值 this.DropDownList1.SelectedIndex
= this.DropDownList1.Items.IndexOf(this.DropDownList1.Items.FindByText(指定项)); //指定Value值 this.DropDownList1.SelectedIndex = this.DropDownList1.Items.IndexOf(this.DropDownList1.Items.FindByValue(指定项));
= this.DropDownList1.Items.IndexOf(new ListItem(指定项));
= this.DropDownList1.Items.IndexOf(this.DropDownList1.Items.FindByText(指定项));