How to use wildcards in SQL query with parameters

Question

Say I have a basic query, something like this:

 SELECT holiday_name
 FROM holiday
 WHERE holiday_name LIKE %Hallow%

This executes fine in m

Answer 1

The %s should be part of the search string, not the query.

string CommandText = "SELECT holiday_name "
                + "FROM holiday "
                + "WHERE holiday_name LIKE @name";
Connection = new SqlConnection(ConnectionString);

try
{
    Connection.Open();
    Command = new SqlCommand(CommandText, Connection);
    string name = "%" + HolidayTextBox.Text + "%";
    Command.Parameters.Add(new SqlParameter("@name", name));