Adding value to TextBox inside Datalist ItemTemplate - asp.net

Question

I am creating an application, in which I am displaying the images(contained in a folder) in a datalist. Each datalist cell is having a ImageButton(clicking on which will show large pic of the image), a delete button(clicking which will delete the image), a edit button and a textbox. Clicking on the edit button will cause the imagefile name to get displayed in the textbox.
here is my .aspx code
<asp:DataList ID="dtlist" runat="server" RepeatColumns="4" CellPadding="5" EnableViewState="True">
<ItemTemplate>
<asp:ImageButton Width="100" ID="ImagePic" ImageUrl='<%# Container.DataItem %>' CommandName='<%# Container.DataItem %>' runat="server" OnClick="ImagePic_Click" ImageAlign="Top">
</asp:ImageButton>
<br />
<asp:Button Width="100" ID="btn_image_del" CommandName='<%# Container.DataItem %>' runat="server" Text="Delete" OnClick="btn_image_del_Click">
</asp:Button>
<br />
<asp:TextBox ID="txt_image_name" Width="100" runat="server" Visible="True" Text='<%# Container.DataItem %>' MaxLength="500" />
</asp:TextBox>
<asp:Button Width="100" ID="btn_image_edit" CommandName='<%# Container.DataItem %>' runat="server" Text="Edit" OnClick="btn_image_edit_Click">
</asp:Button>
</ItemTemplate>
<ItemStyle BorderColor="Brown" BorderStyle="dotted" BorderWidth="3px" HorizontalAlign="Center" VerticalAlign="Bottom" />
</asp:DataList>
And the .cs code is as follows
protected void BindDataList()//shows the pics from the user folder
{
string[] list = Directory.GetFiles(Server.MapPath("/Candidate_Pics/" + Convert.ToString(Session["Sex"]) + "/" + txt_u_name.Text + "/"));
var aList = from fileName in Directory.GetFiles(Server.MapPath("/Candidate_Pics/" + Convert.ToString(Session["Sex"]) + "/" + txt_u_name.Text + "/"))
select string.Format("/Candidate_Pics/" + Convert.ToString(Session["Sex"]) + "/" + txt_u_name.Text + "/{0}", Path.GetFileName(fileName));
dtlist.DataSource = aList;
dtlist.DataBind();
}
protected void ImagePic_Click(object sender, ImageClickEventArgs e)
{
string strImage = ((ImageButton)sender).CommandName;
ViewState["InsertedURL"] = strImage;
ScriptManager.RegisterStartupScript(Page, typeof(Page), "ShowValidation", "javascript:ShowPic();", true);
Large_Pic.ImageUrl = strImage;
}
protected void btn_image_del_Click(object sender, EventArgs e)
{
string del_selected_image = ((Button)sender).CommandName;
File.Delete(Server.MapPath(del_selected_image));
}
protected void btn_image_edit_Click(object sender, EventArgs e)
{
string edit_selected_image = Path.GetFileName(((Button)sender).CommandName);
// Now what should i do:
}
The above three function namely ImagePic_Click,btn_image_del_Click, btn_image_edit_Click are working fine..Deletion, then LargePic view are all working perfectly, my problem is that, I want that when the edit button will be clicked, the corresponding name of the image will be displayed in the Datalist textbox. In the just above function, edit_selected_image is holding the filename of the corresponding image. I have tested it by applying breakpoints. Now the problem is that I want this value should be passed to the textbox "txt_image_name" in the Datalist.

Answer 1

Try this:
TextBox txt =(TextBox)dtlist.FindControl("txt_image_name");
txt.Text = edit_selected_image;

Answer 2

you need to use EditItemTemplate, for editing Edit Template.
you can write your mark up some tihing like this .
<EditItemTemplate>
PictureName:<asp:Label id="PicutreLabel"
Text='<%# DataBinder.Eval(Container.DataItem, "yourFIleNamePath") %>' runat="server"/> <br />
<asp:LinkButton id="UpdateButton" Text="Update" CommandName="Update" runat="server"/>
<asp:LinkButton id="DeleteButton" Text="Delete" CommandName="Delete" runat="server"/>
<asp:LinkButton id="CancelButton" Text="Cancel" CommandName="Cancel" runat="server"/>