Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Extensions/ui/UpdatePanelControlTrigger.cs

@@ -0,0 +1,49 @@
+//------------------------------------------------------------------------------
+// <copyright file="UpdatePanelControlTrigger.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+ 
+namespace System.Web.UI {
+    using System;
+    using System.ComponentModel;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Globalization;
+    using System.Web;
+    using System.Web.UI;
+    using System.Web.Resources;
+
+    public abstract class UpdatePanelControlTrigger : UpdatePanelTrigger {
+        private string _controlID;
+
+        protected UpdatePanelControlTrigger() {
+        }
+
+        [
+        Category("Behavior"),
+        DefaultValue(""),
+        IDReferenceProperty(),
+        ResourceDescription("UpdatePanelControlTrigger_ControlID"),
+        SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "ID")
+        ]
+        public string ControlID {
+            get {
+                return _controlID ?? String.Empty;
+            }
+            set {
+                _controlID = value;
+            }
+        }
+
+        protected Control FindTargetControl(bool searchNamingContainers) {
+            if (String.IsNullOrEmpty(ControlID)) {
+                throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.UpdatePanelControlTrigger_NoControlID, Owner.ID));
+            }
+            Control foundControl = ControlUtil.FindTargetControl(ControlID, Owner, searchNamingContainers);
+            if (foundControl == null) {
+                throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.UpdatePanelControlTrigger_ControlNotFound, ControlID, Owner.ID));
+            }
+            return foundControl;
+        }
+    }
+}