When ctrl+enter is pressed on a textbox, a windows sound is played, how to disable the sound?

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C#

Windows

.NET

forms

It's a program that opens Google search bar and if enter is pressed on it, opens Google search for the term in the textbox, and if Ctrl+Enter is pressed, I'm Feeling Lucky is opened (the first result is opened), I made a button in the form that is accept button, and when Enter is pressed on the form the button gets clicked and no sound is played, however if Ctrl+Enter are pressed an ugly Windows sound is played, I want that when the user presses Ctrl+Enter prevent Windows from playing the ugly sound.

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What I have tried:

if (Properties.Settings.Default.feelingLuckyWeb || Program.LeftCtrlDown || Program.RightCtrlDown)
                        {
                            System.Diagnostics.Process.Start("http://www.google.com/search?q=" + System.Net.WebUtility.UrlEncode(textBoxMain.Text) + "&btnI");
                                               }
                        else
                        {
                            System.Diagnostics.Process.Start("https://www.google.com/search?q=" + System.Net.WebUtility.UrlEncode(textBoxMain.Text));
                        }