protected void Button_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
btn.Text = (Int32.Parse(btn.Text) + 1).ToString();
}
First ScreenShot:

ButtonClick.png

Second ScreenShot:

CreateButtonInCSharp.png

Third ScreenShot:

CreateButtoninDotNet.png
<div>
This is a demonstration of button counter. every time we click the button it is incremented.<br />
First Counter:
<asp:Button
id="Button1"
Text="0"
OnClick="Button_Click"
Runat="server" />
<br /><br />

Second Counter:

<asp:Button
id="Button2"
Text="0"
OnClick="Button_Click"
Runat="server" />
</div>