Validation in VB.Net

Imports System.Text.RegularExpressions
Public Class Validation
    Private Sub Validation_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        DateTimePicker1.MaxDate = Today

    End Sub

    Private Sub txtName_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtName.KeyPress
        If e.KeyChar >= "a" And e.KeyChar <= "z" Or e.KeyChar >= "A" And e.KeyChar <= "Z" Or e.KeyChar = " " Or e.KeyChar = Convert.ToChar(Keys.Back) Then
            'nothing to do valid character
        Else
            e.KeyChar = ""
            txtName.Select()
            MsgBox("Enter only Alphabets", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Invalid Input")
        End If
    End Sub

    Private Sub txtMobile_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtMobile.KeyPress
        If e.KeyChar >= "0" And e.KeyChar <= "9" Or e.KeyChar = Convert.ToChar(Keys.Back) Then

        Else
            e.KeyChar = ""
            txtMobile.Select()
            MsgBox("Enter only Numbers", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Invalid Input")
        End If

    End Sub


    Private Sub txtMobile_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtMobile.Leave
        Try

            If txtMobile.Text.Substring(0, 1) >= 7 And txtMobile.Text.Length = 10 Then

            Else

                txtMobile.Select()
                MsgBox("Enter valid mobile", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Invalid Input")
            End If

        Catch ex As Exception
            MsgBox(ex.Message)

        End Try
    End Sub

    Private Sub txtemail_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtemail.Leave
        Dim f As Boolean
        f = Module1.validateEmail(txtemail.Text)
        If f = False Then
            MsgBox("Enter valid Email", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Invalid Input")
            txtemail.Select()
        End If
    End Sub
    Public Function validateEmail(ByVal emailAddress) As Boolean
        ' Dim email As New Regex("^(?[^@]+)@(?.+)$")
        Dim email As New Regex("([\w-+]+(?:\.[\w-+]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7})")
        If email.IsMatch(emailAddress) Then
            Return True
        Else
            Return False
        End If
    End Function

End Class