command.Parameters.AddWithValue("@searchTerm", searchTerm);
command.CommandText = "SELECT [OA_Name] FROM [Operating_Authority_Table] WHERE [OA_Name] = [@%searchTerm%]";

command.Parameters.AddWithValue("@searchTerm", searchTerm);
command.CommandText = "SELECT [OA_Name] FROM [Operating_Authority_Table] WHERE [OA_Name] = '%' + @searchTerm + '%'";

command.CommandText = "SELECT [OA_Name] FROM [Operating_Authority_Table] WHERE [OA_Name] LIKE '%"+ searchTerm +"%'";

"...WHERE [OA_Name] = '%' + @searchTerm + '%'";

"...WHERE [OA_Name] ALIKE '%' + @searchTerm + '%'";