This question has been raised many times but I couldn't find any concrete sample on how to solve the problem. As you know many mobile devices, especially those running iOS don't allow users to copy an image from a web page and paste its URL in an asp:TextBox . However the image URL can be pasted in the browser's address field. I find this akward.
I want to insert the image URL in this textbox:
<asp:TextBox ValidateRequestMode="Disabled" class="form-control" Style="width: 100%; max-width: 600px" ID="aboutTextBox" runat="server" Text='<%# Bind("about") %>' TextMode="MultiLine" Rows="30" />