How to retrieve textbox value in gridview when happen indexchanging event in asp.net? -

i have gridview bound objectdatasource. add textbox , button each row in grid allow user enter date , click button subscribe. no field exists in gridview textbox , return null refrence when run page. should do? please help.. here's aspx file , code behind:

<asp:templatefield headertext="content" itemstyle-width="150"> <itemtemplate> <asp:textbox id="name" runat="server" /> </itemtemplate> <itemstyle width="150px"></itemstyle> </asp:templatefield> <asp:buttonfield commandname="select" text="save" buttontype="button" />

code-behind:

 protected void gridview1_selectedindexchanging(object sender, gridviewselecteventargs e) {     gridviewrow row = gridview1.rows[e.newselectedindex];      string s = row.cells[0].text;             //fetch value of name.      textbox tb = (textbox)gridview1.findcontrol("name");     string name = tb.text; } 

value of name null...

gridviewrow has findcontrol method. may try,

protected void gridview1_selectedindexchanging(object sender, gridviewselecteventargs e) {     gridviewrow row = gridview1.rows[e.newselectedindex];     textbox tb = row.findcontrol("name") textbox;     string name = tb.text; }