Em cảm ơn ạ
string OldText = string.Empty;
private void textBox1_GotFocus(object sender, EventArgs e)
{
OldText = textBox1.Text;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
string newText = textBox1.Text;
//Compare OldText and newText here
}
Không biết có đúng ý bác ko 😬
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