private void button1_Click(object sender, EventArgs e)
{
String strFileName;
//Find the Office document.
openFileDialog1.FileName = "";
openFileDialog1.ShowDialog();
strFileName = openFileDialog1.FileName;
//If the user does not cancel, open the document.
if (strFileName.Length != 0)
{
Preview preview = new Preview();
FileType ft = new FileType("Ppt Files", "*.Ppt", typeof(PowerPointPreview), null);
preview.DoAction(strFileName, ft, this);
}
}
