C# Photo SLide Show

[taan]

Ik heb deze code is geprobeerd, maar wat doe ik fout?

ArrayList imgList = new ArrayList();
int CurrentImage = 0;
string[] picExt = new string[] { "pmg", "jpg", "gif", "bmp" };

public Form1()
{
InitializeComponent();
//LoadData();
}

private void timer1_Tick(object sender, EventArgs e)
{
fotoPictureBox.Image = (Bitmap)imgList[CurrentImage];
CurrentImage++;
if (CurrentImage == imgList.Count)
CurrentImage = 0;

}

grts