Disbale windows Key

Carnation Flowers

7y944Windows Forms

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

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Dharmendra Kumar Pandit7y ago
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);
}
0
Carnation Flowers7y ago
thankyou for your replay
but still need to stop fn button to make other works
0
Jignesh Kumar7y ago
Hi Carnation,

Please find below link,
https://www.codeproject.com/Questions/382891/Restrict-textbox-from-Special-Characters-and-Numbe
0
Carnation Flowers7y ago
thankyou for your answer
but its windows form and i need to disble sepical key like windows and fn
0
Sreekanth Reddy7y ago
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.
0