Handling Large Data Sets in Silverlight using WCF and Customized DataGrids

namespace MappingDataEditor.Web
{
    using System;
    using System.Text;
    using System.Web;
    using System.Web.Caching;

    /// <summary>
    /// Status of the Uploads
    /// </summary>
    public enum UploadState
    {
        Created,
        Uploading,
        Completed,
        Failed
    }

    public class UploadSession
    {
        private StringBuilder myStringData;

        /// <summary>
        /// Gets or sets (only private) the Handle of this Session - used as key in UploadSessions
        /// </summary>
        public Guid Handle
        {
            get;
            private set;
        }

        /// <summary>
        /// Gets or sets the table name (Custom data)
        /// </summary>
        public string Tablename
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets (only private) the state of the Upload
        /// </summary>
        public UploadState State
        {
            get;
            private set;
        }

        /// <summary>
        /// Constructor
        /// </summary>
        internal UploadSession()
        {
            Handle = Guid.NewGuid();
            State = UploadState.Created;
            myStringData = new StringBuilder();
        }

        /// <summary>
        /// Gets the transfered data - use this when teh upload is done
        /// </summary>
        public string Contents
        {
            get
            {
                return myStringData.ToString();
            }
        }

        /// <summary>
        /// Adds one new block of data
        /// </summary>
        /// <param name="pNewData">Data that will be appended to the content</param>
        public void AddDataBlock(string pNewData)
        {
            State = UploadState.Uploading;
            myStringData.Append(pNewData);
        }

        /// <summary>
        /// Done!
        /// </summary>
        public void Close()
        {
            State = UploadState.Completed;
        }
    }
}