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bool blnIsKeys_A = false;
bool blnIsKeys_B = false;
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)Keys.A)
blnIsKeys_A = true;
else if (e.KeyChar == (char)Keys.B)
blnIsKeys_B = true;
if (blnIsKeys_A && blnIsKeys_B)
{
MessageBox.Show("A+B");
blnIsKeys_A = false;
blnIsKeys_B = false;
}
}