Using CKEditor in GridView Row EditItemTemplate in ASP.Net

Hi,

I using a CKEditor plugin on my project ASP.NET C#.

With CKEditor it is possible to modify the row of the GridView by also inserting images using copy/paste.

This images copy/paste working correctly but on the text editor, but when the edit of row on the GridView is closed on the browser I have this return

src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAXgAAAD6CAYAAACrklzBAAAgAElEQVR4AeydB3gUR7bvR8J77/Pd3fve7t71Zq

I have tried without success

public static string SpliceText(string text, int lineLength)
{
    var charCount = 0;
    var lines = text.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)
                .GroupBy(w => (charCount += w.Length + 1) / lineLength)
                .Select(g => string.Join(" ", g));

    return String.Join("<br />", lines.ToArray());
}

protected void gvProducts_RowUpdating(Object sender, GridViewUpdateEventArgs e)
{
    int ID = Convert.ToInt32(gvProducts.DataKeys[e.RowIndex].Value);
    GridViewRow row = gvProducts.Rows[e.RowIndex];
    TextBox txtpara = (TextBox)row.FindControl("txsezi");
 
    string newText = txtpara.ToString().Replace("'", "`");
 
    using (MySqlConnection myConnectionString =
      new MySqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
    {
        using (MySqlCommand cmd =
            new MySqlCommand("SP", myConnectionString))
        {
            cmd.Connection.Open();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("tpara", newText.ToString());
            cmd.Parameters.AddWithValue("tid", ID.ToString());
            cmd.ExecuteNonQuery();
            cmd.Connection.Close();
        }
    }
 
    gvProducts.EditIndex = -1;
    BindData();
}

<asp:TemplateField HeaderText="Text"
    ItemStyle-HorizontalAlign="Left">
    <ItemTemplate>
        <asp:Label ID="lbsezi" runat="server"
            Text='<%# HttpUtility.HtmlDecode(Mp2smal.SpliceText(Eval("contents").ToString(),150)) %>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txsezi"
            runat="server"
            TextMode="MultiLine"
            Text='<%# HttpUtility.HtmlDecode(Eval("contents").ToString()) %>'
            CssClass="ckeditor"
            CausesValidation="true"
            ValidationGroup="ValidationSummary1"></asp:TextBox>
 
        <asp:RequiredFieldValidator ID="rfsezi" runat="Server"
            ControlToValidate="txsezi"
            SetFocusOnError="true" ErrorMessage="Required" Text=""
            Display="None" ValidationGroup="ValidationSummary1"></asp:RequiredFieldValidator>
    </EditItemTemplate>
</asp:TemplateField>

On the database it's stored this string

<p><span style="text-align:">Text row</span></p><p>&nbsp;</p><p><img alt="" src="data:image/png;base64,iVBORw...

Any help would greatly appreciate.

Thank you.