////////////////////////////////
string s = "\\\\myserver\\data\\images\\myimage.jpg"; //will not find this
string lc_file1 = Server.MapPath(s) //Now it should find it
string lc_file2 = "c:\\media\\images\\myimage.jpg"; //this will be found

///This hits the else statement because it can't find the file.
if (System.IO.File.Exists(lc_file1) == true)
{
///perform not found action
}
else
{
///peform found action
}


///This does find the file on the local drive.
if (System.IO.File.Exists(lc_file2) == true)
{
///perform not found action
}
else
{
///peform found action
}
////////////////////////////////