获取gridview编辑项模板中的文本框和复选框值

THis is my vb.net code to update the name of the person whose booked a car and whether he wants ac or non ac car is handled by a checkbox. When i click on the edit button in gridview. I get a textbox to edit person and a checkbox to select car ac type. After clicking on update the textbox code is not retrieving the edited textbox value, it is taking the binded textbox value. Like suppose if i'm editing from Mathew to John, then it takes Mathew it doesnot take the value of John. Similarly with checkbox, even if i check the checkbox. the checked attribute of checkbox is showing false. Please help me with this. THis is my vb.net code to update the name of th