Cannot update data from Excel sheet to Access database

here my code which need to save data from excel sheet to database access using C#. I don't get any error but my excel data could not be updated in database access.. What I have to do for this?

My Database Access Tablename is "addsales1".

My Excel sheet name is "addsales1".

string file_name = Application.StartupPath + "\\" + "databaseset.txt";
System.IO.StreamReader objreader;
objreader = new System.IO.StreamReader(file_name);
string sh = objreader.ReadLine();
string con = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + textBox9.Text 
    + ";Extended Properties=Excel 8.0;";

OleDbConnection connection = new OleDbConnection(con);
OleDbCommand cmd = new OleDbCommand("INSERT INTO [MS Access;Database=" + sh + 
    "].[addsales1] SELECT * FROM [addsales1$]");

cmd.Connection = connection;
connection.Open();

cmd.ExecuteNonQuery();
connection.Close();

MessageBox.Show("Sales Details Imported Successfully!");