Web Forms :: Add Watermark Text To Images In FormView

I want use this watermark: [URL] ....
 
But I want used in formview, how i change code in C# ?

and this is my FormView:

Asp.net

<asp:FormView ID="FormView1" runat="server" DataKeyNames="id"
DataSourceID="SqlDataSource1" DefaultMode="Insert" Width="1200px">
<InsertItemTemplate>
<table class="style1"><tr>
<td valign="top" class="style5">ناونیشان:</td>

[Code] ....

C#

protected void Upload(object sender, EventArgs e) {
string watermarkText = "© test.com";
//Get the file name.
string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName) + ".png";
//Read the File into a Bitmap.
using (Bitmap bmp = new Bitmap(FileUpload1.PostedFile.InputStream, false))

[Code] .....