''' <summary>
''' Validate integer.
''' </summary>
''' <param name="value">The value.</param>
''' <returns>
''' <c>true</c> if the specified value is integer; otherwise, <c>false</c>.
''' </returns>
<System.Runtime.CompilerServices.Extension()> _
    Public Function IsInteger(ByVal value As String) As Boolean
        If String.IsNullOrEmpty(value) Then
            Return False
        End If
        Dim tempNo As Integer
        Return Integer.TryParse(value, tempNo)
    End Function

Validate Integer Extension Method

VB.NET