你好：
参考以下MSDN文档：
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setboundscore.aspx
可以通过重写SetBoundsCore方法来设置一个固定的长度和宽度，这样在设计时就可以防止其他使用该控件的开发人员调整控件大小：
protected override void SetBoundsCore(int x, int y,
int width, int height, BoundsSpecified specified)
{
// Set a fixed height and width for the control.
base.SetBoundsCore(x, y, 150, 75, specified);
}
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