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Adding value to TextBox inside Datalist ItemTemplate
TextBox txt =(TextBox)dtlist.FindControl("txt_image_name");
txt.Text = edit_selected_image;

<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"/>