Can't update access database threw asp.net - asp.net

Question

my access database wont update with this code. what seems to be the problem?
i have tried a lot of methods for updating my access database with no sucsess
please guys some help.
protected void Btnupdate_Click(object sender, EventArgs e)
{
foreach (RepeaterItem RI in rptEdit.Items)
{
Label id = RI.FindControl("Pid") as Label;
TextBox prdname = RI.FindControl("prdname") as TextBox;
TextBox prdprice = RI.FindControl("prdprice") as TextBox;
TextBox prdshortdesc = RI.FindControl("prdshortdesc") as TextBox;
TextBox prdtype = RI.FindControl("prdtype") as TextBox;
TextBox prdbrand = RI.FindControl("prdbrand") as TextBox;
int updated;
string connection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\Table.accdb";
using (var conn = new OleDbConnection(connection))
{
conn.Open();
string updSql = #"UPDATE ProductList SET
Pname = '" + prdname.Text + "' WHERE Pid = ?";
using (var cmd = new OleDbCommand(updSql, conn))
{
cmd.Parameters.Add("#Pname", OleDbType.VarChar).Value = prdname.Text;
updated = cmd.ExecuteNonQuery();
conn.Dispose();
conn.Close();
}
}
}
}

Answer 1

Just use the ? style parameters in your SQL.
string sql = #"UPDATE ProductList SET Pname = ? WHERE Pid = ?";
Then just make sure you add your parameters in the same order in your code that they appear in the SQL.
cmd.Parameters.Add(prdName.Text);
cmd.Parameters.Add(int.Parse(id.Text));
You need to make sure the type of the variable being added in C# matches the type in the DB (in terms of text or number). Then it can be properly quoted or not as needed.