About the arraylist class

Parameters of the arraylist class are involved in the following method:
/// <Summary>
/// Execute multiple SQL statements to implement database transactions.
/// </Summary>
/// <Param name = "sqlstringlist"> Multiple SQL statements </param>
Public static void executesqltran ( Arraylist sqlstringlist ) // Use the size of the array that can be automatically added as needed to load parameters
{
Using (sqlconnection conn = new sqlconnection (connectionstring ))
{
Conn. open ();
Sqlcommand cmd = new sqlcommand ();
Cmd. Connection = conn;
Sqltransaction Tx = conn. begintransaction (); // starts database transactions at the specified isolation level and transaction name
Cmd. Transaction = TX; // obtain or set sqltransaction (TRANSACT-SQL transaction) for the sqlcommand object to be executed)
Try
{
For (INT n = 0; n <sqlstringlist. Count; n ++)
{
String strsql = sqlstringlist [N]. tostring ();
If (strsql. Trim (). length> 1)
{
Cmd. commandtext = strsql;
Cmd. executenonquery (); // traverse to execute the SQL statement in the dynamic array
}
}
TX. Commit (); // submit database transactions
}
Catch (system. Data. sqlclient. sqlexception E)
{
TX. rollback (); // roll back the transaction from the pending state, and specify the transaction or save point name
Throw new exception (E. Message );
}
}
}

What is the difference between the arraylist class and the array class? arraylist is a complex version of the array class. The arraylist class provides some functions that are provided in most collections classes but not in the array class. The main points are as follows: 1. array is located in the system namespace, while arraylist is located in the system. Collections namespace. 2. the array capacity is fixed, and the arraylist capacity is automatically expanded as needed. If the value of the arraylist. Capacity attribute is changed, the memory quota element is automatically replicated. 3. arraylist provides a method to add, insert, or remove a range of elements. In array, only one element value can be obtained or set at a time. 4. Use synchronized to easily create a synchronization version of arraylist. Array will keep it until the user achieves synchronization. 5. arraylist provides a method to return read-only and fixed-size packages to a set, but array does not. 6. On the other hand, array provides some flexibility that arraylist does not have. 7. You can set the lower limit of array, but the lower limit of arraylist is always zero. 8. array can have multiple dimensions, while arraylist is always only one-dimensional 9. Specific types of arrays have better performance than arraylist because the elements of arraylist belong to the object type, therefore, boxing and unboxing are often generated when you store or retrieve value types.