inserting value into excel

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C#

C#4.0

Hi,

am inserting data into excel when the card is swiped,am using oledb connection
my code is :

<pre lang="xml">private string GetConnectionString()
       {
           Dictionary<string, string> props = new Dictionary<string, string>();

           // XLSX - Excel 2007, 2010, 2012, 2013
           props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
           props["Extended Properties"] = "Excel 12.0 XML";
           props["Data Source"] = "C:\\MyExcel.xlsx";

         
           StringBuilder sb = new StringBuilder();

           foreach (KeyValuePair<string, string> prop in props)
           {
               sb.Append(prop.Key);
               sb.Append('=');
               sb.Append(prop.Value);
               sb.Append(';');
           }

           return sb.ToString();
       }</pre>

and inserting data code in button click is:

string connectionString = GetConnectionString();

 using (OleDbConnection conn = new OleDbConnection(connectionString))
 {
     conn.Open();
     OleDbCommand cmd = new OleDbCommand();
     cmd.Connection = conn;

     //cmd.CommandText = "CREATE TABLE [table1] (id INT);";
     //cmd.ExecuteNonQuery();

     cmd.CommandText = "INSERT INTO [sheet1$](id) VALUES(" + newString + ");";
     cmd.ExecuteNonQuery();

     conn.Close();
 }

here newString variable contains data as string "0008478660" but in excel it's inserting as "8478660" . how insert complete string as it is, with zero's