Disbale windows Key

Question

hi every one if you can help plz dont hesitate to give me answer would help me i m working on exam project using windows form c# almost done but i need to lock key board and special keys like windows and alt anf F1,2..etc so i tried many function none get me solution i tried key down press but its not working without fn key so how can i disable this also wating you guys my best regards

Dharmendra Kumar Pandit · Answer

Try this code. protected override bool ProcessCmdKey( ref Message msg, Keys keyData) { try { if (keyData == Keys.LWin) { MessageBox.Show( "You cann't use Left windows button" ); } else if (keyData == Keys.RWin) { MessageBox.Show( "You cann't use Right windows button" ); } else if (keyData == Keys.F1) { MessageBox.Show( "You cann't use F1 button" ); } else if (keyData == Keys.F2) { MessageBox.Show( "You cann't use F2 button" ); } else if (keyData == Keys.F3) { MessageBox.Show( "You cann't use F3 button" ); } else if (keyData == Keys.F4) { MessageBox.Show( "You cann't use F4 button" ); } else if (keyData == Keys.F5) { MessageBox.Show( "You cann't use F5 button" ); } else if (keyData == Keys.F6) { MessageBox.Show( "You cann't use F6 button" ); } else if (keyData == Keys.F7) { MessageBox.Show( "You cann't use F7 button" ); } else if (keyData == Keys.F8) { MessageBox.Show( "You cann't use F8 button" ); } else if (keyData == Keys.F9) { MessageBox.Show( "You cann't use F9 button" ); } else if (keyData == Keys.F10) { MessageBox.Show( "You cann't use F10 button" ); } else if (keyData == Keys.F11) { MessageBox.Show( "You cann't use F11 button" ); } else if (keyData == Keys.F12) { MessageBox.Show( "You cann't use F12 button" ); } else if (keyData == Keys.LMenu) { MessageBox.Show( "You cann't use Left Alt button" ); } else if (keyData == Keys.RMenu) { MessageBox.Show( "You cann't use Right Alt button" ); } else if (keyData == Keys.LControlKey) { MessageBox.Show( "You cann't use Left Alt button" ); } else if (keyData == Keys.RControlKey) { MessageBox.Show( "You cann't use Right Alt button" ); } else if (keyData == Keys.Escape) { MessageBox.Show( "You cann't use Esc button" ); } else { MessageBox.Show(keyData.ToString()); } } catch (Exception ex) { } // Call the base class return base .ProcessCmdKey( ref msg, keyData); }

Carnation Flowers · Answer

thankyou for your replay but still need to stop fn button to make other works

Jignesh Kumar · Answer

Hi Carnation, Please find below link, https://www.codeproject.com/Questions/382891/Restrict-textbox-from-Special-Characters-and-Numbe

Carnation Flowers · Answer

thankyou for your answer but its windows form and i need to disble sepical key like windows and fn

Sreekanth Reddy · Answer

Hi Carnation, Try the below one : "JavaScript" > document.onkeypress = function (event) { event = (event || window.event); if (event.keyCode == 123) { //alert('No F-12'); return false ; } } document.onmousedown = function (event) { event = (event || window.event); if (event.keyCode == 123) { //alert('No F-keys'); return false ; } } document.onkeydown = function (event) { event = (event || window.event); if (event.keyCode == 123) { //alert('No F-keys'); return false ; } } Thank you.