webservices Bind GridView

//connectionStrings>
add name="Master" connectionString="Data Source=SF-74\SQLEXPRESS;user id=;pwd=;Trusted_Connection=true" />

/connectionStrings>

//use some NameSpaces

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Xml;
using System.Data;

[WebMethod]
public XmlDocument GetDataFromDB()
{
string errorMessage = "";
XmlDocument myDatas = new XmlDocument();
//Connection string is stored in the web.config file as an appSetting
string connectionString = ConfigurationManager.ConnectionStrings["Master"].ConnectionString;
SqlConnection dbConnection = null;
// Open a connection to the database
try
{
dbConnection = new SqlConnection(connectionString);
dbConnection.Open();
}
catch (Exception ex)
{
errorMessage = ex.Message;
}
if (errorMessage == "")
{
// Build an insert command
string SQL = "select * From sa";
SqlCommand GetCustomerCmd = new SqlCommand(SQL, dbConnection);

try
{
SqlDataAdapter custDA = new SqlDataAdapter();
custDA.SelectCommand = GetCustomerCmd;
DataSet custDS = new DataSet();
custDA.Fill(custDS, "ProfileContact");
myDatas.LoadXml(custDS.GetXml());
dbConnection.Close();

}
catch (System.Exception ex)
{
errorMessage = ex.Message;

}
finally
{
dbConnection.Dispose();
}
}
return myDatas;
}


////////////aspx.cs

localhost.WebService2 proxy = new WebApplication1.localhost.WebService2();

protected void Page_Load(object sender, EventArgs e)
{
XmlDocument myServiceDoc = new XmlDocument();
System.Xml.XmlNode neNode;
//Adding the resulting XML from WebMethod to a user created XmlNode
neNode = proxy.GetDataFromDB();
//Creating a Dataset
DataSet myDataSet = new DataSet();
//The XmlNode is added to a byte[]
byte[] buf = System.Text.ASCIIEncoding.ASCII.GetBytes(neNode.OuterXml);
System.IO.MemoryStream ms = new System.IO.MemoryStream(buf);
//The XML is readed from the MemoryStream
myDataSet.ReadXml(ms);

GridView1.DataSource = myDataSet.Tables[0];
GridView1.DataBind();

//GridView1.DataSource = proxy.GetDataFromDB();
//GridView1.DataBind();

}