oledb c# code to auto generated ID in a textbox

Question

I need a c# code that auto generate ID in a textbox

Vulpes · Answer

Assuming that the textBox's Text property is set to an initial value in Form_Load by reading in the last ID used from the database or otherwise then this should increment that value each time a button is clicked: private void button1_Click(object sender EventArgs e) { int i; if (int.TryParse(textBox1.Text out i)) { textBox1.Text = (i + 1).ToString(D4); } } The D4 format will fill the number out to 4 digits by adding leading zeros if necessary.. So you'll get 0001 0002 etc.