.NET (Core and Framework)

library project1;

{$mode objfpc}{$H+}

uses
  Classes;

procedure DoHelloWorld(var Source: string) stdcall; export;
begin
  Source := 'Hello world :)';
end;

exports DoHelloWorld;

begin
end.

Imports System.Runtime.InteropServices
Imports System.Text

Module Module1

    <DllImport("project1.dll", EntryPoint:="DoHelloWorld", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Ansi)> _
    Public Sub DoHelloWorld(ByRef Source As StringBuilder)
    End Sub

    Sub Main()
        Dim sb As New StringBuilder()
        DoHelloWorld(sb)
        Console.WriteLine(sb.ToString())
        Console.ReadKey()
    End Sub

End Module

Bastard Programmer from Hell

DateTime getDate;
bool valid = DateTime.TryParse(textBox1.Text, System.Globalization.CultureInfo.CurrentCulture, System.Globalization.DateTimeStyles.AllowWhiteSpaces, out getDate);

if (valid)
	label1.Text = getDate.ToLongDateString();
else
	label1.Text = "Not a valid date";

schampacc wrote:

I have requirement where user can pass all types of datetime formats.

schampacc wrote:

It returns true for 05/04/2011 but returns false
for 25/04/2011

schampacc wrote:

pass all types of datetime formats

DateTimeStyles styles = DateTimeStyles.None;
DateTime startDate;
foreach (CultureInfo cInfo in CultureInfo.GetCultures(CultureTypes.AllCultures))
               {
               DateTime.TryParse("stringDate", cInfo, styles, out startDate)
               }

schampacc wrote:

Then in this case one should go for one particular format only.

Pete O'Hanlon wrote:

conform to ISO 8601