// Copyright 2010 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

public partial class _Default : System.Web.UI.Page
{

    private ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResultCollection _callbackResultCollection = new ESRI.ArcGIS.ADF.Web.UI.WebControls.CallbackResultCollection();
    private string _targetResourceName = "MapResourceItem0";

    #region ASP.NET Web Page Events

    protected void Page_Load(object sender, System.EventArgs e)
    {
       ScriptManager1.RegisterAsyncPostBackControl(ClearAllButton);
       ClearAllButton.Click += new System.EventHandler(ClearAllButton_Click);
    }
        protected void Page_PreRender(object sender, System.EventArgs e)
    {
        try
        {
            // Initialize the target resource name session variable only if the page request is at the beginning
            // of a session
            if (Session.IsNewSession)
                Session["targetResourceName"] = _targetResourceName;

            // Make sure the page is not being rendered during a postback (i.e. is rendering during initial page
            // load or on page refresh)
            if (!IsPostBack)
            {
                // Create a query functionality object to use for retrieving the target resource's queryable layers
                ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality commonMapFunctionality =
                    (ESRI.ArcGIS.ADF.Web.DataSources.IMapFunctionality)Map1.GetFunctionality(_targetResourceName);
                ESRI.ArcGIS.ADF.Web.DataSources.IGISResource gisResource = commonMapFunctionality.Resource;
                ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality queryFunctionality =
                    (ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality)gisResource.CreateFunctionality(
                        typeof(ESRI.ArcGIS.ADF.Web.DataSources.IQueryFunctionality), null);

                // Retrieve the queryable layers
                string[] layerIDs = null;
                string[] layerNames = null;
                queryFunctionality.GetQueryableLayers(null, out layerIDs, out layerNames);

                // Add the queryable layers to the active layer drop-down list
                for (int i = 0; i < layerNames.Length; i++)
                    activeLayerDropDownList.Items.Add(layerNames[i]);

                // Add all the ArcGIS Server unit types to the units drop-down list except for unknown, points, 
                // and decimal degress
                System.Array agsUnitTypes = System.Enum.GetValues(typeof(ESRI.ArcGIS.ADF.Web.DataSources.Units));
                foreach (int agsUnitType in agsUnitTypes)
                {
                    string unit = agsUnitTypes.GetValue(agsUnitType).ToString();
                    if ((unit != "Unknown") && (unit != "DecimalDegrees") && (unit != "Points"))
                        unitsDropDownList.Items.Add(unit);
                }
            }
        }
        catch (System.Exception exception)
        {
            string jsErrorAlertString = string.Format("<script>{0}</script>", 
                Utility.GetJavaScriptErrorString(exception));
            Response.Write(jsErrorAlertString);
        }
    }

    #endregion

    #region ASP.Net Web Controls events

        void ClearAllButton_Click(object sender, System.EventArgs e)
        {
            ClearGraphicsAndSelection();
        }
        #endregion

    #region Instance Methods

        // Clears all selected features and removes all graphics from the target resource
    private void ClearGraphicsAndSelection()
    {
        // Get the map functionality of the target resource
        ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality agsMapFunctionality = 
            Map1.GetFunctionality(_targetResourceName) as
            ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality;

        // Get the map description of the target resource and clear all graphics from it
        ESRI.ArcGIS.ADF.ArcGISServer.MapDescription agsSoapMapDescription = 
            agsMapFunctionality.MapDescription;        
        agsSoapMapDescription.CustomGraphics = null;

        // Iterate through each layer's layer description and clear all selected features
        // from each
        ESRI.ArcGIS.ADF.ArcGISServer.LayerDescription[] agsSoapLayerDescriptionArray = 
            agsSoapMapDescription.LayerDescriptions;
        foreach (ESRI.ArcGIS.ADF.ArcGISServer.LayerDescription agsSoapLayerDescription in 
        agsSoapLayerDescriptionArray)
            agsSoapLayerDescription.SelectionFeatures = null;

        // Refresh the target resource so the changes are displayed
        Map1.RefreshResource(_targetResourceName);
        _callbackResultCollection.CopyFrom(Map1.CallbackResults);
        ScriptManager1.RegisterDataItem(Page, _callbackResultCollection.ToString(), false);
    }

        #endregion

}