ajax c# html jquery

i have create program which is work for read excel file and print data into html table,

note:- i have use all control in html but web page is aspx because that is my requirement.

html and ajax code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

and c# code is here :

public partial class Default2 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

[WebMethod]

public static string GetExcelData(string byteData)

{

byte[] bytes = Convert.FromBase64String(byteData);

string filePath = HttpContext.Current.Server.MapPath("~/Files/Test.xls");

if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/Files")))

{

Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/Files"));

}

// Save file in File folder.

File.WriteAllBytes(filePath, bytes);

string extension = Path.GetExtension(filePath);

string excelConnectionString = "";

switch (extension)

{

case ".xls": //Excel 97-03

excelConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=YES;IMEX=1;'";

break;

case ".xlsx": //Excel 07

excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=1;'";

break;

}

excelConnectionString = String.Format(excelConnectionString, filePath);

OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);

OleDbCommand cmdExcel = new OleDbCommand();

OleDbDataAdapter oleDA = new OleDbDataAdapter();

cmdExcel.Connection = excelConnection;

excelConnection.Open();

DataTable dtExcelSchema;

dtExcelSchema = excelConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();

excelConnection.Close();

excelConnection.Open();

cmdExcel.CommandText = "SELECT * From [" + SheetName + "]";

oleDA.SelectCommand = cmdExcel;

DataSet ds = new DataSet();

oleDA.Fill(ds);

excelConnection.Close();

// Delete saved file.

// Directory.Delete(HttpContext.Current.Server.MapPath("~/Files"), true);

return ds.GetXml();

}

}

My actual problem is it return in html form data but i want to in table form and another problem is

POST 500 (Internal Server Error)

Can anyone one help me?