导致错误提供程序的验证问题

问题描述

在我的登录表单中，我有2个文本框(txtUsername和txtPassword)和3个按钮-btnLogin，btnBack和btnCancel.我使用errorProvider组件来验证2个文本框.现在的问题是，尽管我将返回"和取消"按钮的causes验证属性设置为"false"，但与登录"按钮一起，返回"和取消"按钮也引起了验证.我只希望登录"按钮引起验证，而不希望表单中的所有按钮.
我使用以下代码来验证文本框，并且我正在使用Visual Studio2010.

In my Login form i have 2 textboxes (txtUsername and txtPassword) and 3 buttons- btnLogin, btnBack and btnCancel. I used errorProvider component to validate the 2 textboxes. Now the problem is, along with the Login button, the back and cancel button is also causing validation though i set the causes validation property of back and cancel button to ''false''. I want only the Login button to cause validation and not all the buttons in the form.
I used the following code to validate the textboxes and i am using visual studio 2010.

Private Sub txtUserName_Validating(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtUserName.Validating
        ErrorProvider1.SetError(txtUserName, "")
        With txtUserName
            If .Text = String.Empty Then
                BtnCancel_LoginForm.CausesValidation = False
                BtnBack_LoginForm.CausesValidation = False
                ''cancel the event
                e.Cancel = True
                ErrorProvider1.SetError(txtUserName, "Required field")
                Label2.ForeColor = Color.Red
            Else
                Label2.ForeColor = Color.Maroon
            End If
        End With
    End Sub

无法检测出错误的位置和错误..请有人帮助....

Cant detect where and what is the mistake.. please somebody help....

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