if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
string sourceFileName = openFileDialog1.FileName;
int nLength = sourceFileName.Length - sourceFileName.LastIndexOf("/") - 1;
FileName = sourceFileName.Substring(sourceFileName.LastIndexOf("/") + 1, nLength);
string destFileName = Application.StartupPath + @"pic" + FileName;
System.IO.File.Copy(sourceFileName, destFileName);
pictureBox1.Image = Image.FromFile(destFileName);
}