怎样提高WebService的性能

服务器端WebService程序using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.IO.Compression;
using System.Data.sqlClient;
………
public class Service1 : System.Web.Services.WebService
{

    [WebMethod(Description = "直接返回 DataSet 对象。")]
    public DataSet GetnorthwindDataSet()
    {
        string sql = "SELECT * FROM DB";
        sqlConnection conn = new sqlConnection("Server=60.28.25.58;DataBase=s168593;user id=s168593;password=*****;");
        conn.open();
        sqlDataAdapter dataadapter = new sqlDataAdapter(sql, conn);
        DataSet ds = new DataSet();
        dataadapter.Fill(ds, "DB");
        conn.Close();
        return ds;
    }
    
    [WebMethod(Description = "返回 DataSet 对象用 Binary 序列化后的字节数组。")]
    public byte[] GetDataSetBytes()
    {
        DataSet dataSet = GetnorthwindDataSet();
        BinaryFormatter ser = new BinaryFormatter();
        MemoryStream ms = new MemoryStream();
        ser.Serialize(ms, dataSet);
        byte[] buffer = ms.ToArray();
        return buffer;
    }
    
    [WebMethod(Description = "返回 DataSetSurrogate 对象用 Binary 序列化后的字节数组。")]
    public byte[] GetDataSetSurrogateBytes()
    {
        DataSet dataSet = GetnorthwindDataSet();
        DataSetSurrogate dss = new DataSetSurrogate(dataSet);
        BinaryFormatter ser = new BinaryFormatter();
        MemoryStream ms = new MemoryStream();
        ser.Serialize(ms, dss);
        byte[] buffer = ms.ToArray();
        return buffer;
    }
    
    [WebMethod(Description = "返回 DataSetSurrogate 对象用 Binary 序列化并 Zip 压缩后的字节数组。")]
    public byte[] GetDataSetSurrogateZipBytes()
    {
        DataSet dataSet = GetnorthwindDataSet();
        DataSetSurrogate dss = new DataSetSurrogate(dataSet);
        BinaryFormatter ser = new BinaryFormatter();
        MemoryStream ms = new MemoryStream();
        ser.Serialize(ms, dss);
        byte[] buffer = ms.ToArray();
        byte[] zipBuffer = Compress(buffer);
        return zipBuffer;
    }
    
    public byte[] Compress(byte[] data)
    {
        try
        {
            MemoryStream ms = new MemoryStream();
            Stream zipStream = null;
            zipStream = new GZipStream(ms, CompressionMode.Compress, true);
            zipStream.Write(data, 0, data.Length);
            zipStream.Close();
            ms.Position = 0;
            byte[] compressed_data = new byte[ms.Length];
            ms.Read(compressed_data, int.Parse(ms.Length.ToString()));
            return compressed_data;
        }
        catch
        {
            return null;
        }
    }
}

客户端WebService程序

private void button1_Click(object sender, EventArgs e) {     com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();     DateTime dtBegin = DateTime.Now;     DataSet dataSet = ds.GetnorthwindDataSet();     this.label1.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin);     binddata(dataSet); } private void button2_Click(object sender, EventArgs e) {     com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();     DateTime dtBegin = DateTime.Now;     byte[] buffer = ds.GetDataSetBytes();     BinaryFormatter ser = new BinaryFormatter();     DataSet dataSet = ser.Deserialize(new MemoryStream(buffer)) as DataSet;     this.label2.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin) + "  " + buffer.Length;     binddata(dataSet); } private void button3_Click(object sender, EventArgs e) {     com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();     DateTime dtBegin = DateTime.Now;     byte[] buffer = ds.GetDataSetSurrogateBytes();     BinaryFormatter ser = new BinaryFormatter();     DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;     DataSet dataSet = dss.ConvertToDataSet();     this.label3.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin) + "  " + buffer.Length;     binddata(dataSet); } private void button4_Click(object sender, EventArgs e) {     com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();     DateTime dtBegin = DateTime.Now;     byte[] zipBuffer = ds.GetDataSetSurrogateZipBytes();     byte[] buffer = UnZipClass.Decompress(zipBuffer);     BinaryFormatter ser = new BinaryFormatter();     DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;     DataSet dataSet = dss.ConvertToDataSet();     this.label4.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin) + "  " + zipBuffer.Length;     binddata(dataSet); } private void binddata(DataSet dataSet) {     this.dataGridView1.DataSource = dataSet.Tables[0];     this.label5.Text = "共计：" + dataSet.Tables[0].Rows.Count + "条记录"; } 客户端UnZipClass程序 public static class UnZipClass {     public static byte[] Decompress(byte[] data)     {         try         {             MemoryStream ms = new MemoryStream(data);             Stream zipStream = null;             zipStream = new GZipStream(ms, CompressionMode.Decompress);             byte[] dc_data = null;             dc_data = ExtractBytesFromStream(zipStream, data.Length);             return dc_data;         }         catch         {             return null;         }     }     public static byte[] ExtractBytesFromStream(Stream zipStream, int dataBlock)     {         byte[] data = null;         int totalBytesRead = 0;         try         {             while (true)             {                 Array.Resize(ref data, totalBytesRead + dataBlock + 1);                 int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);                 if (bytesRead == 0)                 {                     break;                 }                 totalBytesRead += bytesRead;             }             Array.Resize(ref data, totalBytesRead);             return data;         }         catch         {             return null;         }     } }