<div class="cmxform">
    <table>
        <tr>
            <td><asp:Label id="lblVorname" runat="server" AssociatedControlID="tbVorname" Text="Vorname: " /> <asp:TextBox ID="tbVorname" runat="server" Text="" /></td>
            <td><asp:Label id="lblNachname" runat="server" AssociatedControlID="tbNachname" Text="Nachname: " /><asp:TextBox ID="tbNachname" runat="server" Text="" /></td>
            <td><asp:Label id="lblEmail" runat="server" AssociatedControlID="tbEmail" Text="Email: " /><asp:TextBox ID="tbEmail" runat="server" Text="" /></td>
            <td><asp:Button ID="btnSuche" runat="server" Text="suchen" OnClick="btnSuche_OnClick" /></td>
        </tr>
    </table>
    <asp:GridView ID="GridViewKontakte" runat="server" AllowPaging="True"
        AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="id" 
        DataSourceID="SqlDataSourceKontakte" PageSize="50" OnRowUpdating="GridViewKontakte_OnRowUpdating">
        <Columns>
            <asp:TemplateField HeaderText="">
                <ItemTemplate>
                   <asp:LinkButton ID="btnDelete" Text="Löschen" runat="server" OnClientClick="return confirm('Soll dieser Datensatz wirklich gelöscht werden?');" CommandName="Delete" />
                </ItemTemplate>
            </asp:TemplateField>            
            <asp:CommandField ShowEditButton="True" />
            <asp:BoundField DataField="id" HeaderText="id" InsertVisible="False" ReadOnly="True" SortExpression="id" />
            <asp:TemplateField HeaderText="anrede" SortExpression="anrede">
                <ItemTemplate>
                    <asp:Label ID="lbAnrede" runat="server" Text='<%#Bind("anrede") %>' />
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:DropDownList ID="cbAnrede" runat="server" 
                     DataSourceID="SqlDataSourceAnrede" DataTextField="bezeichnung" DataValueField="ID"
                     SelectedValue='<%# BindEx(DataBinder.Eval(Container.DataItem,"anrede")) %>'
                     AppendDataBoundItems="False" AutoPostBack="true" OnSelectedIndexChanged="cbAnrede_OnSelectedIndexChanged" />
                </EditItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="vorname" HeaderText="vorname" SortExpression="vorname" />
            <asp:BoundField DataField="nachname" HeaderText="nachname" SortExpression="nachname" />
            <asp:BoundField DataField="email" HeaderText="email" SortExpression="email" />
            <asp:CheckBoxField DataField="newsletterabo" HeaderText="newsletterabo" SortExpression="newsletterabo" />
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSourceKontakte" runat="server" 
        ConnectionString="<%$ ConnectionStrings:CMSConnectionString %>" 
        DeleteCommand="DELETE FROM [kontakte] WHERE [id] = @original_id" 
        InsertCommand="INSERT INTO [kontakte] ([anrede], [vorname], [nachname], [email], [newsletterabo]) VALUES (@anrede, @vorname, @nachname, @email, @newsletterabo)" 
        OldValuesParameterFormatString="original_{0}" 
        SelectCommand="SELECT [id], [anrede], [vorname], [nachname], [email], [newsletterabo] FROM [kontakte] WHERE (([email] LIKE @email + '%') AND ([nachname] LIKE @nachname + '%') AND ([vorname] LIKE @vorname + '%'))" 
        UpdateCommand="UPDATE [kontakte] SET [anrede] = @anrede, [vorname] = @vorname, [nachname] = @nachname, [email] = @email, [newsletterabo] = @newsletterabo WHERE [id] = @original_id">
        <SelectParameters>
            <asp:ControlParameter ControlID="tbEmail" Name="email" PropertyName="Text" Type="String" ConvertEmptyStringToNull="false" />
            <asp:ControlParameter ControlID="tbNachname" Name="nachname" PropertyName="Text" Type="String" ConvertEmptyStringToNull="false" />
            <asp:ControlParameter ControlID="tbVorname" Name="vorname" PropertyName="Text" Type="String" ConvertEmptyStringToNull="false" />
        </SelectParameters>
        <DeleteParameters>
            <asp:Parameter Name="original_id" Type="Int32" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="anrede" Type="Int32" />
            <asp:Parameter Name="vorname" Type="String" />
            <asp:Parameter Name="nachname" Type="String" />
            <asp:Parameter Name="email" Type="String" />
            <asp:Parameter Name="newsletterabo" Type="Boolean" />
            <asp:Parameter Name="original_id" Type="Int32" />
        </UpdateParameters>
        <InsertParameters>
            <asp:Parameter Name="anrede" Type="Int32" />
            <asp:Parameter Name="vorname" Type="String" />
            <asp:Parameter Name="nachname" Type="String" />
            <asp:Parameter Name="email" Type="String" />
            <asp:Parameter Name="newsletterabo" Type="Boolean" />
        </InsertParameters>
    </asp:SqlDataSource>
    <asp:SqlDataSource ID="SqlDataSourceAnrede" runat="server" ConnectionString="<%$ ConnectionStrings:CMSConnectionString %>" 
        SelectCommand="SELECT [id], [bezeichnung] FROM [anrede] ORDER BY [id]">
    </asp:SqlDataSource>
</div>

public partial class CMSInlineControls_PromontAM_admin_kontakte : CMS.ExtendedControls.InlineUserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Session.Remove("cbAnredeSelection");
        }

        if (!HttpContext.Current.User.Identity.IsAuthenticated)
            Response.Redirect("~/SERVICE/ADMIN.aspx");
    }

    protected void btnSuche_OnClick(object sender, EventArgs e)
    {
        GridViewKontakte.DataBind();
    }

    protected void GridViewKontakte_OnRowUpdating(Object sender, GridViewUpdateEventArgs e)
    {
        e.NewValues["anrede"] = Session["cbAnredeSelection"].ToString();
    }

    protected void cbAnrede_OnSelectedIndexChanged(object sender, EventArgs e)
    {
        GetSelectedAnrede();
    }

    private void GetSelectedAnrede()
    {
        foreach (GridViewRow r in this.GridViewKontakte.Rows)
        {
            if (r.RowState == DataControlRowState.Edit || r.RowState == (DataControlRowState.Edit | DataControlRowState.Alternate))
            {
                DropDownList dl = (DropDownList)r.FindControl("cbAnrede");
                if (dl != null)
                {
                    Session["cbAnredeSelection"] = dl.SelectedValue;
                }
                break;
            }
        }
    }

    public string BindEx(object input)
    {
        string ret = "";
        if (input != null)
        {
            ret = input.ToString();
            if (Session["cbAnredeSelection"] == null)
            {
                Session["cbAnredeSelection"] = ret;
            }
            else if (ret != Session["cbAnredeSelection"].ToString() && !string.IsNullOrEmpty(Session["cbAnredeSelection"].ToString()))
            {
                ret = Session["cbAnredeSelection"].ToString();
            }
        }
        else
        {
            ret = Session["cbAnredeSelection"].ToString();
        }
        return ret;
    }
}