vb.net按提醒 vbnet trim

怎样在vb.net里做一个日历提醒?急~~~~~~【vb.net按提醒 vbnet trim】Public Class Form1
Dim 设置时间 As DateTime
Private Sub D1_CloseUp(ByVal sender As Object, ByVal e As System.EventArgs) Handles 日期时间选择.CloseUp
和.Text = 日期时间选择.Value
设置时间 = 日期时间选择.Value
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
日期时间选择.Value = https://www.04ip.com/post/Now
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If Now.ToString = 和.Text Then
提醒显示.Text = "时间到了 你该去做些什么事了吧"
'Timer1.Enabled = False
Else
提醒显示.Text = "现在时间是:"Now
End If
End Sub
Private Sub 和_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 和.TextChanged
设置时间 = 和.Text
End Sub
End Class
Vb.net中,如何让光标在button1上,按下enter键提示abc?设置你的Form窗体的AcceptButton属性为button1 , 
按下enter键显示abc就是代码(对应的button1的Click事件):
private sub button1_Click(byval sender as System.Object,byval e as System.EventArgs)Handles button1.Click
MessageBox.show(“abc”)
end sub
怎么让vb.net提示代码用提示筐
MsgBox(消息文本vb.net按提醒,显示按纽vb.net按提醒,标题)
例如vb.net按提醒:msgbox("是否退出系统?",vbokcancel+vbquestion,"提示")
VB.NET判断一个TXT内容是否为空文件,是则提醒 。代码怎么写?很简单的txt=“”就提示
If TextBox1.Text ="" Then
MsgBox("不能为空", MsgBoxStyle.OkOnly + MsgBoxStyle.Exclamation, "错误提示")
'或者这样
If TextBox1.Text = "" Then'错误提示
ErrorProvider1.SetError(TextBox1, "用户名不能为空")
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