C#设计的程序如何更改应用程序的图标

不知道该怎么改，注意！是应用程序的图标，不是窗体的图标，谢谢哈

1.当“解决方案资源管理器”中有项目选中时，在“项目”菜单上单击“属性”。
2.选择“应用程序”窗格。
3.从“图标”下拉列表中选择图标 (.ico) 文件。

获取图标： using system; using system.runtime.interopservices; using system.drawing; namespace windowsapptmp { public class extracticon { [dllimport("shell32.dll")] private static extern int shgetfileinfo ( string pszpath, uint dwfileattributes, out shfileinfo psfi, uint cbfileinfo, shgfi uflags ); [structlayout(layoutkind.sequential)] private struct shfileinfo { public shfileinfo(bool b) { hicon=intptr.zero;iicon=0;dwattributes=0;szdisplayname="";sztypename=""; } public intptr hicon; public int iicon; public uint dwattributes; [marshalas(unmanagedtype.lpstr, sizeconst=260)] public string szdisplayname; [marshalas(unmanagedtype.lpstr, sizeconst=80)] public string sztypename; }; private extracticon() { } private enum shgfi { smallicon = 0x00000001, largeicon = 0x00000000, icon = 0x00000100, displayname = 0x00000200, typename = 0x00000400, sysiconindex = 0x00004000, usefileattributes = 0x00000010 } public static icon geticon(string strpath, bool bsmall) { shfileinfo info = new shfileinfo(true); int cbfileinfo = marshal.sizeof(info); shgfi flags; if (bsmall) flags = shgfi.icon|shgfi.smallicon|shgfi.usefileattributes; else flags = shgfi.icon|shgfi.largeicon|shgfi.usefileattributes; shgetfileinfo(strpath, 256, out info,(uint)cbfileinfo, flags); return icon.fromhandle(info.hicon); } }