webparts_Connection Zone

Hi I am using Visual Studio 2005.

i have some problem about web parts connection Zone...
In my application I am useing two web zones A,B.
A zone consists of a drop down list ,and B zone cosists of a gridView
which is being popouated
 with the selected value from A Zone.
 Its working Fine ......
& now i am added my application in Declarative catalog & Page catalog.
Now i am closing Zone B.its added to page catalog.
Now i am clicking page catalog. & added to Web zone B.Its added.
But I am choosing drop down value from A, & B zone gridview values are not populated.
Because using Interface value is NULL.
pl tell me the solution of that problem..........
------------------------------
I am added my Code:
appcode/Tableinfo,cs:
------------------------------
public interface intertableName
{
    string strTableName { get;}
}
------------------------------
Web zone A usercontrol:

public partial class Usercontrols_DBInformation : System.Web.UI.UserControl, intertableName
{
    public string strTableName
    {
        get
        {
            return ddlTableName.SelectedItem.Text;
        }
    }

   
    [ConnectionProvider("Table Name")]
    public intertableName ProvideTableName()
    {
        return this;
    }
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            Database dbtableinfo = null;
            DataSet dstableinfo = new DataSet();
            DbCommand dbcommtableinfo = null;
            dbtableinfo = DatabaseFactory.CreateDatabase("DBConn");
            string sqlCommtableinfo = "sp_display_tables";
            dbcommtableinfo = dbtableinfo.GetStoredProcCommand(sqlCommtableinfo);
            dstableinfo = (DataSet)dbtableinfo.ExecuteDataSet(dbcommtableinfo);
        
            ddlTableName.DataSource = dstableinfo;
            ddlTableName.DataMember = "Table";
            ddlTableName.DataTextField = "name";
            ddlTableName.DataValueField = "name";
            ddlTableName.DataBind();
            ddlTableName.Items.Insert(0, new ListItem("-- Select --", String.Empty));

        }
    }
------------------------------
.ascx page:

------------------------------
Web zone B usercontrol:

   private intertableName _tableName;

    [ConnectionConsumer("Table Name")]
    public void ConsumeTableName(intertableName nametable)
    {
        _tableName = nametable;
    }

    private void Page_PreRender()
    {
        if (_tableName != null)
        {
            if (_tableName.strTableName != "-- Select --")
            {
              Database db = null;
                DataSet dataset = new DataSet();
                DbCommand dbCommand = null;
                db = DatabaseFactory.CreateDatabase("DBConn");
                string sqlCommand = "select * from " + _tableName.strTableName;
                dbCommand = db.GetSqlStringCommand(sqlCommand);
                dataset = (DataSet)db.ExecuteDataSet(dbCommand);
                gvTableInformation.DataSource = dataset.Tables[0];
                gvTableInformation.DataBind();
                lblRecords.Visible = false;
            }
            else
            {
                lblRecords.Text = "Please select the Table name";
            }
           
       }
    }
------------------------------
.ascx page:

------------------------------
Now ASPX PAGE:
<%@ Register TagPrefix="table" TagName="dbinfo" Src="~/Usercontrols/DBInformation.ascx"%>
<%@ Register TagPrefix="table" TagName="tableinfo" Src="~/Usercontrols/TableDetails.ascx" %>
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

http://www.w3.org/1999/xhtml" >

    
   


   

   

            id="WebPartManager1"
        Runat="server" Personalization-InitialScope="Shared" >
       
                    ID="WebPartConnection1"
            ProviderID="Dbinfo"
            ConsumerID="Tableinfo" />
       
    

                    id="Menu1"
            OnMenuItemClick="Menu1_MenuItemClick"
            Orientation="Horizontal"
            CssClass="menu"
            Runat="server">
           
           
           
           
           
           
       

                    id="WebPartZone1"
            CssClass="column"
            Runat="server">
           
                                Description="Please Select the Table in Drop down & Hit the button">
               
           
       

                    id="WebPartZone2"
            CssClass="column"
            Runat="server">
           
                                Description="Table's Information" runat="server">
               
           
       
       
       
       
       
       
       
       
       
       
       
       
       
                        id="BehaviorEditorPart1"
                Runat="server" />
       
       
   

   

------------------------------
 protected void Menu1_MenuItemClick(object sender, MenuEventArgs e)
    {
        WebPartManager1.DisplayMode = WebPartManager1.DisplayModes[e.Item.Text];
    }
------------------------------

pl tell me the solution....