i want to compare data in xml file with data in database

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Data.SqlClient;
using System.Reflection;
using System.CodeDom;
using System.Collections.Specialized;

namespace WindowsFormsApplication8try
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label3_Click(object sender, EventArgs e)
        {

        }

       
             private void button1_Click(object sender, EventArgs e)
        {
            XmlWriter writer = XmlWriter.Create(@"C:\SIEM\xml.xml");

            writer.WriteStartElement("QUERY");

            writer.WriteStartElement("IT");
            writer.WriteAttributeString("macName", textBox1.Text);
            writer.WriteElementString("Generated_source", textBox2.Text);
            writer.WriteElementString("TimeStemp", textBox3.Text);
            writer.WriteEndElement();
            
      writer.Close();}

             private void button2_Click(object sender, EventArgs e)
             {

                 string myXMLfile = @"C:\SIEM\xml.xml";
                 DataSet ds = new DataSet();
                 // Create new FileStream with which to read the schema.
                 System.IO.FileStream fsReadXml = new System.IO.FileStream
                     (myXMLfile, System.IO.FileMode.Open);
                 try
                 {
                     //nchar(10) Source;

                     //string Machine_Name = null;

                     //double Time_stemp = 0;
                     //DataSet ds = new DataSet();

                     ds.ReadXml(fsReadXml);
                     DataTable dbTable1 = ds.Tables[0];
                     connString = 
                     DataTable dt = new DataTable("query_table");

DataColumn col1 = new DataColumn("Machine_Name");

DataColumn col2 = new DataColumn("Source_generated");

DataColumn col3 = new DataColumn("Time_stemp");


dt.Columns.Add(col1);

dt.Columns.Add(col2);

ds.Tables.Add(dt);

//Add Employee Data to the table

//Create a new row and add the data to the corresponding columns

//DataRow dr; dr = dt.NewRow();

//dr ["Name"] = "Rajesh";

//dr ["Address"] = "Hagley Road";

//dt.Rows.Add(dr);

//dr = dt.NewRow();

//dr ["Name"] = "Tim Easton";

//dr ["Address"] = "London";

//dt.Rows.Add(dr);

//dr = dt.NewRow();

//dr ["Name"] = "Sara";

//dr ["Address"] = "Oxford";

//// Now add the datarows to the datatable

//dt.Rows.Add(dr);

// After adding the rows to the datatable use AcceptChanges method if there are any changes

ds.AcceptChanges();
                     dataGridView1.DataSource = dbTable1;
                    //ds.ReadXml("Xml.xml");
                     string myConnectionString ="Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Documents\Downloads\WindowsFormsApplication8try\Database1.mdf;Integrated Security=True;User Instance=True";
                      SqlConnection myConnection = new SqlConnection(myConnectionString);
                     
                     string query = "insert into query_table values(" + Machine_Name + ",'" + Source + "'," + Time_stemp + ")";
                     DataAdapter objAdapter = new DataAdapter(query,myConnectionString);
                    
                     objAdapter.Fill(ds);

                     //          for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)

                     //{

                     //    Machine_Name = ds.Tables[0].Rows[i].ItemArray[0];

                     //    Source = ds.Tables[0].Rows[i].ItemArray[1].ToString();

                     //   Timestemp = ds.Tables[0].Rows[i].ItemArray[2];
                    // DataTable query_table = new DataTable();
                     

                     // string sqlcommand = "insert into query_table values(" + Machine_Name + ",'" + Source + "'," + Time_stemp + ")";

                    // sqlcommand = new SqlCommand(sqlcommand, connection);

                    //objAdapter.InsertCommand = command;

                    // query_tableTableAdapter.InsertCommand.ExecuteNonQuery();



                 }
                 catch (Exception ex)
                 {
                     MessageBox.Show(ex.ToString());
                 }
                 finally
                 {
                     fsReadXml.Close();
                 }
             }
                 
             
             private void Form1_Load(object sender, EventArgs e)
             {
                 System.Data.SqlClient.SqlDataAdapter query_tableTableAdapter = new SqlDataAdapter();
                 //System.Data.SqlClient.SqlDataAdapter query_tableTableAdapter = new SqlDataAdapter();
                 //  This line of code loads data into the 'database1DataSet.query_table' table.
                 query_tableTableAdapter.Fill(this.database1DataSet1.query_table);
                 // This line of code loads data into the 'dataSet1.Credit' table. 

                // query_tableTableAdapter.Fill(this.database1DataSet1.query_table);


             }

        
    }}