No value given for one or more required parameters error while deleting in database

Question

Every time I execute a DELETE query on my database, the following error results:

No value given for one or more required parameters

I check the names but still have the error. Below is the code used to execute the query:

connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "delete FROM Accounts WHERE Id_No = " + IdNoBox.Text + "";
command.CommandText = query;
command.ExecuteNonQuery();
MessageBox.Show("Successfully Deleted");
this.Close();
connection.Close();

Answer 1

Assuming Id_No to be string, it should be enclosed in single quotes.Otherwise, it will be considered as a parameter. the query should string query = "delete FROM Accounts WHERE Id_No = "'" + IdNoBox.Text + "'";

Answer 2

To address the specific question being asked, if Id_No is a character based, there should be single quotes around it. For readability, consider the following syntax.

string query = string.Format("delete FROM Accounts WHERE Id_No = '{0}' ", IdNoBox.Text);

Also note that the connection/command should be disposed of properly, including the cases where an exception occurs. An easy way to do this is with the using clause. See below.

using (var connection = new OleDbConnection())
using (var command = new OleDbCommand(){Connection = connection,CommandText = query})
{
    connection.Open();
    command.ExecuteNonQuery();
}
MessageBox.Show("Successfully Deleted");