Is there a builtin confirmation dialog in Windows Forms?

I'd like to create a simple confirm dialog saying "Please check the information and if you're sure it's correct, click OK."

Is there something built in like this?

Here is an example. You can try something like this.

var confirmResult =  MessageBox.Show("Are you sure to delete this item ??",
                                     "Confirm Delete!!",
                                     MessageBoxButtons.YesNo);
if (confirmResult == DialogResult.Yes)
{
    // If 'Yes', do something here.
}
else
{
    // If 'No', do something here.
}

You can also try MessageBoxButtons.OKCancel instead of MessageBoxButtons.YesNo. It depends on your requirements.

2. If you have .Net Framework 4.6 or above please try this.

MessageBoxResult confirmResult = MessageBox.Show("Are you sure to delete this item ??", "Confirm Delete!!", MessageBoxButton.YesNo);`

if (confirmResult == MessageBoxResult.Yes)
{
   // If 'Yes', do something here.
}
else
{
   // If 'No', do something here.
}

MessageBox.Show? You can specify the title, caption, and a few options for which buttons to display.

On the other hand, if you're asking people to confirm information, that sounds like you probably want to show a custom dialog - which you can do with Form.ShowDialog.

In .Net Core you can do it like this:

DialogResult dialogResult= MessageBox.Show("Are you sure to delete?", "Confirm", MessageBoxButtons.YesNo);

if (dialogResult == DialogResult.Yes)
{
    //if code here....            
}
else
{
   //else code here.... 
}

Output Result