如何实现当某textBox控件成为焦点时，自动打开搜狗输入法；失去焦点时，恢复原有输入法

今晚测试的结果，如下：

        private InputLanguage ThisFormDefaultInputLanguage = InputLanguage.DefaultInputLanguage;
 
        private void txtContent_Enter(object sender, EventArgs e)
        {
            InputLanguageCollection  ilc  =  InputLanguage.InstalledInputLanguages;    
            foreach(InputLanguage il in ilc)  
　          {
　　            if(il.LayoutName.Contains("搜狗"))
                    InputLanguage.CurrentInputLanguage = il;
　          }
            foreach(InputLanguage il in ilc)  
　          {
　　            if(il.LayoutName.Contains("中文"))
                    InputLanguage.CurrentInputLanguage = il;
　          }
        }
 
        private void txtContent_Leave(object sender, EventArgs e)
        {
            InputLanguage.CurrentInputLanguage = ThisFormDefaultInputLanguage;
        }