foreignkey_edit.ascx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using System.Web.DynamicData;

public partial class ForeignKey_EditField : System.Web.DynamicData.FieldTemplateUserControl {
    protected void Page_Load(object sender, EventArgs e) {
        if (DropDownList1.Items.Count == 0) {
            if (!Column.IsRequired) {
                DropDownList1.Items.Add(new ListItem("[Not Set]", ""));
            }

            PopulateListControl(DropDownList1);
        }
    }

    protected override void OnDataBinding(EventArgs e) {
        base.OnDataBinding(e);

        if (Mode == DataBoundControlMode.Edit) {
            string foreignkey = ForeignKeyColumn.GetForeignKeyString(Row);
            ListItem item = DropDownList1.Items.FindByValue(foreignkey);
            if (item != null) {
                DropDownList1.SelectedValue = foreignkey;
            }
        }
    }

    protected override void ExtractValues(IOrderedDictionary dictionary) {
        // If it's an empty string, change it to null
        string val = DropDownList1.SelectedValue;
        if (val == String.Empty)
            val = null;

        ExtractForeignKey(dictionary, val);
    }

    public override Control DataControl {
        get {
            return DropDownList1;
        }
    }
}