Hi,
Try this
OleDbDataAdapter ap = new OleDbDataAdapter();
methods m = new methods();
OleDbCommand c;
string command = ("UPDATE Users SET Id = @id, User = @user WHERE Id = @id");
c = new OleDbCommand(command, con);
c.Parameters.Add("@id", OleDbType.VarChar, 14, "<id>");
c.Parameters.Add("@user", OleDbType.VarChar, 25, "<user>");
ap.UpdateCommand = c;
con.ConnectionString = conection;
con.Open();
ap.UpdateCommand.ExecuteNonQuery();