ModalPopupExtender - 弹出gridview，允许用户选择行并使用列详细信息填充文本框

Basically, I have a textbox where a user can enter an ID from a database. To make things easier, the user can popup a GridView using a ModalPopupExtender to display all the tables columns, and they can Select a row, which then closes the modalpopupextender and sets the textbox to the row's ID column.Basically, I have a textbox where a user can en