Button.Enable = "true/false" - enabling / disabling buttons within

<asp:FormView ID="Envelope" runat="server" DataSourceID="SqlDataSource1"
            AllowPaging="True"
            OnItemDeleted = "ArticleEnvelope_Deleted"
            OnItemInserted = "ArticleEnvelope_Inserted"
            OnItemUpdated = "ArticleEnvelope_Updated">
...
<itemtemplate>
...
&nbsp;<asp:Button enabled="true" ID="btnEdit" runat="server" Text="Edit" OnClick="btnEdit_Click" CommandName="Edit" />
...
</itemtemplate>

protected void btnEdit_Click(object sender, EventArgs e)
   {
        //btnSave.Enabled = true 
   }

foreach (Control ctrl in Page.Controls)
       {
           TextBox1.Text = ctrl.ToString();
       }