winform textbox光标进入时，自动切换到五笔输入法

private void txtSearch_Enter(object sender, EventArgs e)
{
txtSearch.ImeMode = System.Windows.Forms.ImeMode.On;
//InputLanguage.CurrentInputLanguage=InputLanguage.FromCulture(System.Globalization.CultureInfo.GetCultureInfo("zh-CN"));

string[] languagename = new string[] { "五笔", "拼音", "中文" };
bool bResult = false;
for (int i = 0; i < languagename.Length; i++)
{
foreach (InputLanguage lang in InputLanguage.InstalledInputLanguages)
{
if (lang.LayoutName.IndexOf(languagename[i]) >= 0)
{
InputLanguage.CurrentInputLanguage = lang;
bResult = true;
break;
}
}

if (bResult)
break;
}
}