I found IT

Editor("Microsoft.VSDesigner.Data.ADO.Design.OleDbConnectionStringEditor, Microsoft.VSDesigner, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")

thanks

 Dear Sir
 I'd like to create a user control that has a connection string property that allows the user to setup a connection at design time in the same fashion as in Project settings or TableAdapters.

 When a someone adds this control to their form, there will be a property called ConnectionString that when it is clicked (via the Properties grid), it will bring up the Connection Properties dialog box.

 I tried the following code:
 namespace UserControls

 {

     public partial class UserControl1 : UserControl

     {

         public UserControl1()

         {

             InitializeComponent();

         }

         private string _connectionstring;

         [RefreshProperties(RefreshProperties.All),  RecommendedAsConfigurable(true), DefaultValue(""), Editor("Microsoft.VSDesigner.Data.SQL.Design.SqlConnectionStringEditor, Microsoft.VSDesigner, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]

         public string Connectionstring

         {

             get { return _connectionstring; }

             set { _connectionstring = value; }

         }

     }

 }

 but the Editor used allow to build SQL connections only, Is there other Editors help building other databases connections.

 Ahmed Hashish