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    <p>Unfortunately, you cannnot set the proxy per insnance. Not even per application - it is global. If you chnage it for a .net app, it will impact IE as well.</p> <p>Here is complete code to change the proxy.</p> <p>Create a "Form1" with buttons "B_Get" "B_Set" and "B_Disable" and then paste this code.</p> <p>It should work for you. I used this app as proof of concept for an automatic proxy cycler i built.</p> <p>Depending on your applications needs, you may be able to switch it, and then switch it back. Note that it WILL impact internet explorer.</p> <p>To verify that this is working, check internet explorer. You will probably have to open/close the options dialog for IE, but you shouldnt need to restart the browser.</p> <p>This will also impact .NET apps on the fly - if you run my program while yours is running, you will be able to change the proxy that your program is using.</p> <pre><code>Imports Microsoft.Win32 Imports System.Runtime.InteropServices Public Class Form1 &lt;DllImport("wininet.dll")&gt; Public Shared Function InternetSetOption(hInternet As IntPtr, dwOption As Integer, lpBuffer As IntPtr, dwBufferLength As Integer) As Boolean End Function Public Const INTERNET_OPTION_SETTINGS_CHANGED As Integer = 39 Public Const INTERNET_OPTION_REFRESH As Integer = 37 'This function is what is called after editing the registry - this causes internet explorer to update its proxy even if it is already open. 'It also effects the web browser control in any VB.net application that is running. Public Sub globalProxy_apply() Dim settingsReturn As Boolean = False Dim refreshReturn As Boolean = False settingsReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0) If Not settingsReturn Then MessageBox.Show("Error 001: Line ""InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0)"" failed.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End If refreshReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0) If Not refreshReturn Then MessageBox.Show("Error 002: Line ""InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0)"" failed.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End If End Sub Public Function globalProxy_IsProxyEnabled() As Boolean Try Dim Regs As RegistryKey = Registry.CurrentUser.CreateSubKey("Software\Microsoft\Windows\CurrentVersion\Internet Settings", RegistryKeyPermissionCheck.ReadWriteSubTree) If Regs.GetValue("ProxyEnable") &lt;&gt; Nothing Then If Regs.GetValue("ProxyEnable").ToString() = "0" Then Return False Else Return True End If Else Return False End If Catch ex As Exception MessageBox.Show("Error 01X: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) Return False End Try End Function Public Function globalProxy_GetProxyServer() As String Try Dim Regs As RegistryKey = Registry.CurrentUser.CreateSubKey("Software\Microsoft\Windows\CurrentVersion\Internet Settings", RegistryKeyPermissionCheck.ReadWriteSubTree) If Regs.GetValue("ProxyServer") &lt;&gt; Nothing Then Return Regs.GetValue("ProxyServer").ToString() Else Return "" End If Catch ex As Exception MessageBox.Show("Error 02X: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) Return "" End Try End Function Public Sub globalProxy_DisableProxy() Dim regkey As RegistryKey Try regkey = Registry.CurrentUser.CreateSubKey("Software\Microsoft\Windows\CurrentVersion\Internet Settings") regkey.SetValue("ProxyEnable", False, RegistryValueKind.DWord) regkey.Close() Catch ex As Exception MessageBox.Show("Error 03X: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try globalProxy_apply() End Sub Public Sub globalProxy_SetProxy(ByVal ServerName As String) Dim regkey As RegistryKey Try regkey = Registry.CurrentUser.CreateSubKey("Software\Microsoft\Windows\CurrentVersion\Internet Settings") regkey.SetValue("ProxyServer", ServerName, RegistryValueKind.Unknown) regkey.SetValue("ProxyEnable", True, RegistryValueKind.DWord) regkey.Close() Catch ex As Exception MessageBox.Show("Error 04X: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try globalProxy_apply() End Sub Private Sub B_Set_Click(sender As System.Object, e As System.EventArgs) Handles B_Set.Click If TextBox1.Text = "" Then globalProxy_DisableProxy() Else globalProxy_SetProxy(TextBox1.Text) End If End Sub Private Sub B_Disable_Click(sender As System.Object, e As System.EventArgs) Handles B_Disable.Click globalProxy_DisableProxy() End Sub Private Sub B_Get_Click(sender As System.Object, e As System.EventArgs) Handles B_Get.Click If globalProxy_IsProxyEnabled() Then TextBox1.Text = globalProxy_GetProxyServer() Else TextBox1.Text = "" End If End Sub End Class </code></pre>
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    1. POWebbrowser Each Control different proxy
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    1. COyou can also programatically open the internet settigns for windows... that was the one feature that i omitted in the code above, because it wasnt directly related to the question... its a 1 liner though: Call Shell("RunDLL32.exe Shell32.dll Control_RunDLL InetCpl.cpl", vbNormalFocus)
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