Imports System.Management
Imports System.Net
Imports System.Net.NetworkInformation
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim IPAddress As String = (TextBox1.Text)
        Dim SubnetMask As String = (TextBox2.Text)
        Dim Gateway As String = (TextBox3.Text)
        Dim objMC As ManagementClass = New ManagementClass("Win32_NetworkAdapterConfiguration")
        Dim objMOC As ManagementObjectCollection = objMC.GetInstances()
        For Each objMO As ManagementObject In objMOC
            If (Not CBool(objMO("IPEnabled"))) Then
                Continue For
            End If
            Try
                Dim objNewIP As ManagementBaseObject = Nothing
                Dim objSetIP As ManagementBaseObject = Nothing
                Dim objNewGate As ManagementBaseObject = Nothing
                objNewIP = objMO.GetMethodParameters("EnableStatic")
                objNewGate = objMO.GetMethodParameters("SetGateways")
                'Set DefaultGateway
                objNewGate("DefaultIPGateway") = New String() {Gateway}
                objNewGate("GatewayCostMetric") = New Integer() {1}
                'Set IPAddress and Subnet Mask
                objNewIP("IPAddress") = New String() {IPAddress}
                objNewIP("SubnetMask") = New String() {SubnetMask}
                objSetIP = objMO.InvokeMethod("EnableStatic", objNewIP, Nothing)
                objSetIP = objMO.InvokeMethod("SetGateways", objNewGate, Nothing)
                Console.WriteLine("Updated IPAddress, SubnetMask and Default Gateway!")
            Catch ex As Exception
                MessageBox.Show("Unable to Set IP : " & ex.Message)
            End Try
        Next objMO
    End Sub
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            getip()
        Catch ex As Exception
            ex.ToString()
        End Try
        Dim PrimaryNic As New Collection
        Dim PNic As String = ""
        For Each networkCard As NetworkInterface In NetworkInterface.GetAllNetworkInterfaces
            For Each gatewayAddr As GatewayIPAddressInformation In networkCard.GetIPProperties.GatewayAddresses
                If gatewayAddr.Address.ToString <> "0.0.0.0" And networkCard.OperationalStatus.ToString() = "Up" Then
                    Dim IpAddress As UnicastIPAddressInformation
                    For Each IpAddress In networkCard.GetIPProperties.UnicastAddresses
                        TextBox2.Text = (IpAddress.IPv4Mask.ToString)
                    Next
                    ' Get IP gateway information  
                    TextBox3.Text = (gatewayAddr.Address.ToString)
                End If
            Next
        Next
    End Sub
    Private Sub getip()
        Dim hostname As String = Dns.GetHostName
        Dim ip As String = System.Net.Dns.GetHostByName(hostname).AddressList(0).ToString
        TextBox1.Text = ip
    End Sub
End Class