// 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 LabelPointRendererPage : System.Web.UI.Page 
{
  protected void Page_Load(object sender, System.EventArgs e)
  {
    if (!ScriptManager1.IsInAsyncPostBack)
    {
      // Potential inital load. Check if graphics resource has the graphics layer, and if not, create it
      ESRI.ArcGIS.ADF.Web.UI.WebControls.MapResourceItem mapResourceItem = 
                MapResourceManager1.ResourceItems.Find("GraphicsDataSource");
      ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapResource graphicsMapResource = 
                mapResourceItem.Resource as ESRI.ArcGIS.ADF.Web.DataSources.Graphics.MapResource;

      if (graphicsMapResource != null)
      {
                // Check whether the map extent is null, meaning the map has not yet been initialized
                if (Map1.Extent == null)
                {
                    // Forces earlier initialization of map and will set map extent
                    ESRI.ArcGIS.ADF.Web.DataSources.IMapResource primaryMapResource =
                        Map1.PrimaryMapResourceInstance;
                }

                // Call helper method in App_Code which generates a random graphics layer.  In real-world situations,
                // the random layer could be replaced with, for instance, the result of a query.  Once the layer is
                // created, apply the renderer and add the layer to the graphics resource.
                
                ESRI.ArcGIS.ADF.Web.Display.Graphics.FeatureGraphicsLayer featureGraphicsLayer = 
                    ESRI.ADF.Samples.Renderers.GenerateGraphicsHelper.CreatePointFeatures("points", Map1.Extent, 50);

        if (featureGraphicsLayer != null)
        {
          // Apply the LabelPointRenderer to the graphics layer
          ESRI.ADF.Samples.Renderers.LabelPointRenderer renderer = 
                        new ESRI.ADF.Samples.Renderers.LabelPointRenderer();
          renderer.LabelColumn = "RandomName"; // Name of column that contains the label text
          renderer.BackgroundColor = System.Drawing.Color.FromArgb(255, 255, 255, 200);
          featureGraphicsLayer.Renderer = renderer; // Assign renderer

                    // If a layer of the same name has already been added, remove it
                    if (graphicsMapResource.Graphics.Tables.Contains("points"))
            graphicsMapResource.Graphics.Tables.Remove("points"); 

                    // Add the layer to the graphics resource
          graphicsMapResource.Graphics.Tables.Add(featureGraphicsLayer);
        }
      }
            
            // Refresh the graphics resource so the newly added layer shows up
            Map1.RefreshResource("GraphicsDataSource");
    }
  }

}