C#

TheTinSoldier wrote:

if an object doesn't implement IDisposable is there any point in using Using?

public static bool IsPortInUse(string portName) {
    try {
        SerialPort sp = null;
        try {
            sp = new SerialPort(portName);
            sp.Open();
            return false;
        } catch (Exception ex) {
            throw ex;
        } finally {
            if (sp != null) {
                sp.Dispose();
            }
        }
    } catch (UnauthorizedAccessException e) {
        return true;
    }
}

BoneSoft wrote:

It does not also call Close(), only Dispose().

public class SerialPort : Component
{
    public void Close()
    {
        this.Dispose(true);
    }
    protected override void Dispose(bool disposing)
    {
        if (disposing && this.IsOpen)
        {
            this.internalSerialStream.Flush();
            this.internalSerialStream.Close();
            this.internalSerialStream = null;
        }
        base.Dispose(disposing);
    }
}

Luc Pattyn wrote:

you can Open() a port after it has been closed (cant be true if Close disposes of port)

internal static class SqlHelper
{
    private static Dictionary<Type, SqlDbType> types = new Dictionary<Type, SqlDbType>();
    static SqlHelper()
    {
        types.Add(typeof(int), SqlDbType.Int);
        types.Add(typeof(double), SqlDbType.Float);
        // ...
    }
    public static SqlDbType GetType(Type type)
    {
        if (types.ContainsKey(type))
            return types[type];
        return SqlDbType.Variant;
    }
}

<code>private void dgv_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            DataGridView dgv = sender as DataGridView;

            if (dgv.Columns[e.ColumnIndex] is DataGridViewButtonColumn)
            {
                DataForm df = new DataForm(dgv.Rows[e.RowIndex]);
                df.ShowDialog();
            }
        }

Mostafa_Ismail wrote:

.s. dont want these mails to be recieved as spams