Update TextBox in GridView by external Image Button

I have 2 blank TextBoxs in GridView's TempleteField and want to get text value in both of them to code behind (aspx.vb) after input and clicking my image button. I think I should rebind Gridview before refer textbox value but I don't know how. From my example code, my both variable don't have any value.
"my.aspx.vb"
Protected Sub btn1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs)
 For i = 0 To myGridView.Rows.Count - 1
  Dim TextBox1 As String = CType(myGridView.Rows(i).FindControl("TxtBox1"), TextBox).Text <---- *
  Dim TextBox2 As String = CType(myGridView.Rows(i).FindControl("TxtBox2"), TextBox).Text <---- *
   '\\\ Both of TextBox1 and TextBox2 don't have any value. There're empty.
 Next
End Sub
////////////
"my.aspx"
<asp:GridView ID="GvData" runat="server" 
AutoGenerateColumns="False" 
AllowSorting="True">
 <Columns>  
  <asp:TemplateField >
   <ItemTemplate> 
    <asp:TextBox ID="TxtBox1" runat="server" />
   </ItemTemplate>
  </asp:TemplateField>
                        
  <asp:TemplateField>
   <ItemTemplate>
    <asp:TextBox ID="TxtBox2" runat="server" />
   </ItemTemplate>
  </asp:TemplateField>
</Columns>
</asp:GridView>

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KrichayaAsked:
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KrichayaConnect With a Mentor Author Commented:
Arghhhhhh !!!!

I found my stupid thing. I put boundata function with postback. Thanx Both of You so much. I get a correct point.
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jinn_hnnlConnect With a Mentor Commented:
IF you bind your GridView from codebehind dynamically then you might have to rebind them as the page is postedback. I dont think this is the case.

Well, you can try enable view state of the textBox to see what happen
<asp:TextBox ID="TxtBox1" EnableViewState="true" runat="server" />

JINN

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prairiedogConnect With a Mentor Commented:
>>>I think I should rebind Gridview before refer textbox value
If you do this, then all input is gone, that is why your TextBox controls don't have any values in your code-behind.
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KrichayaAuthor Commented:
Thanx JINN , but I still not get a point. It still not have any value back.

prairiedog : It's just my idea. I'm very newbie. So I don't find any way to complete it.

PS. now it still not get any value. At First, It's blank textbox in templete field. I want to input some numeric and click external image button outside gridview and send it to code-behind. Please suggest me more.

Thankyou
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jinn_hnnlCommented:
Hi, sorry for the late response. I am back to my office just now.

Glad you work it out ^^.

It would be nice if you can elaborate a little more for our future reference.

JINN
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