Data Controls :: HTML Decode GridView Cell Values And Insert In Database

I copy in a DataTable a GridView to display this GridView in a another page. It works but the gridview's content is not encoded in UTF-8.

This is the code which copy the gridview in a DataTable :

protected void ButtonDisplay_Click(object sender, EventArgs e)
{
// On copie dans un DataTable toute GridView filtré
DataTable dt = new DataTable();
for (int i = 0; i < GridView1.Columns.Count; i++)

[CODE] ...