Problem with writing to a spreadsheet

[Serg_zone]

I'm having a bit a of a problem writing to a spreadsheet using OLEDB. I can insert fine, but all the number i insert come up as strings in the spreadsheet. I tried converting to a double using Cdbl() however the number still shows up as a string. Here is a simple implementation of my class:

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.Common;

namespace ConsoleApplication2
{
    class MyClass
    {
        private DbConnection mDbConnection = null;

        public MyClass()
        {
            Connect();
        }

        public void WriteSomething()
        {
            DbCommand dbCommand = null;

            try
            {
                if (mDbConnection != null)
                {
                    dbCommand = mDbConnection.CreateCommand();
                    dbCommand.CommandText = "INSERT INTO [UploadSheet$] (Field1, Field2, Field3) VALUES(Cdbl(4.3), \"Test1\",\"Test2\")";
                    dbCommand.ExecuteNonQuery();
                }
            }
            catch (Exception exp)
            {
                throw exp;
            }
            finally
            {
                dbCommand.Dispose();
                Disconnect();
            }
        }

        protected void Connect()
        {
            string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source='template.xls';Extended Properties='Excel 8.0;HDR=YES'";

            DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");

            try
            {
                mDbConnection = factory.CreateConnection();
                mDbConnection.ConnectionString = connectionString;
                mDbConnection.Open();
            }
            catch (Exception exp)
            {
                throw exp;
            }
        }

        protected void Disconnect()
        {
            try
            {
                if (mDbConnection != null)
                {
                    mDbConnection.Close();
                }
            }
            catch (Exception exp)
            {
                throw exp;
            }
            finally
            {
                mDbConnection.Dispose();
            }
        }
    }
}

Does anybody have a suggestion?