I have created sample code for you, hope it will help.
ASPX Code
<body>
<form id="form1" runat="server">
<div>
<%=SetInput()%>
</div>
</form>
</body>
C# Server Code
protected void Page_Load(object sender, EventArgs e)
{
if (Request["submit1"] != null)
{
ClickMeHandler();
}
}
private void ClickMeHandler()
{
Response.Write("ClickMe Clicked");
}
protected string SetInput()
{
return "<input value='ClickeME' type='submit' name='submit1' />";
}