copy xml file into sql database tables

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using System.Xml;
using System.Data.SqlClient;
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        private void button1_Click(object sender, EventArgs e)
        {
            //load xml document
            XmlDocument doc = new XmlDocument();
            doc.Load("c:\\aaa\\xmlFile.xml");
 
            //find root node (<Table>)
            XmlNode tableNode = null;
            foreach (XmlNode childNode in doc.ChildNodes)
            {
                if (childNode.Name == "Table")
                {
                    tableNode = childNode;
                }
            }
            if (tableNode == null) throw new Exception("<Table> node not found");
 
            //find <Rows> Node
            XmlNode rowsNode = null;
            foreach (XmlNode childNode in tableNode.ChildNodes)
            {
                if (childNode.Name == "Rows")
                {
                    rowsNode = childNode;
                }
            }
            if (rowsNode == null) throw new Exception("<Table> node doesn't contain <Rows> node");
 
            //loop htrough all <Row> nodes
            foreach (XmlNode childNode in rowsNode.ChildNodes)
            {
                if (childNode.Name == "Row")
                {
                    XmlNode rowNode = childNode;
 
                    int Column1value = 0;
                    string Column2value = "";
                    string Column3value = "";
                    int Column4value = 0;
 
                    foreach (XmlNode columnNode in rowNode.ChildNodes)
                    {
                        //find node for each column
                        if (columnNode.Name == "Column1")
                        {
                            Column1value = int.Parse(columnNode.InnerText);
                        }
                        else if (columnNode.Name == "Column2")
                        {
                            Column2value = columnNode.InnerText;
                        }
                        else if (columnNode.Name == "Column3")
                        {
                            Column3value = columnNode.InnerText;
                        }
                        else if (columnNode.Name == "Column4")
                        {
                            Column4value = int.Parse(columnNode.InnerText);
                        }
                    }
                    SaveRowToDataBase(Column1value, Column2value, Column3value, Column4value);
                }
            }
        }
 
        private void SaveRowToDataBase (int col1, string col2, string col3, int col4)
        {
            string ConnectionString = "Server=.\\SQLEXPRESS;Initial Catalog=test;UID=username;Password=password";
            string SQL = "INSERT INTO someTable VALUES (" + col1.ToString() + ", '" + col2 + "', '" + col3 + "', " + col4.ToString() + ")";
            
            SqlConnection conn = new SqlConnection(ConnectionString);
            SqlCommand cmd = new SqlCommand(SQL,conn);
 
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
        }

                                              

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