C#

private void btn_Click(object sender, EventArgs e)
{
        if (folder.Visible==true )
        {
           btn.Text = "Hi";
         }
         else
         {
            btn.Text = "By";
         }

}

declare array of size n

for count = 0, count less than n
  create a new instance of button
  set the text of the button
  add it to the parent control collection (where parent could be a form, a panel, or the like)
end for  

public Form1()
       {
           InitializeComponent();

           var buttons = new Button[5];
           for (int i = 1; i < buttons.Length; i++)
           {
               buttons[i] = new Button();
               buttons[i].Text = "[button" + i + "]";
               buttons[i].Location = new Point(0, 25 * i);
           }

           Controls.AddRange(buttons);
       }

private void SetScrollPosition(){
	string script;
	ClientScriptManager CSManager = Page.ClientScript;
	if(!CSManager.IsOnSubmitStatementRegistered(this.GetType(),"SaveScrollPosition")){
		script = "var HiddenField = document.getElementById('" + vertscrollposition.ClientID + "');\n\r";
		script += "var ScrollElement = document.getElementById('" +	panel_contents.ClientID + "');\n\r";
		script += "HiddenField.value = ScrollElement.scrollTop;\n\r";
		CSManager.RegisterOnSubmitStatement(this.GetType(), "SaveScrollPosition",script);
	}									//end if
	if(!CSManager.IsStartupScriptRegistered(this.GetType(),"RetrieveScrollPosition")){
		script = "var HiddenField = document.getElementById('" + vertscrollposition.ClientID + "');\n\r";
		script += "var ScrollElement = document.getElementById('" + panel_contents.ClientID + "');\n\r";
		script += "if(HiddenField.value != '')\n\r";
		script += "{\n\r";
		script += "ScrollElement.scrollTop = HiddenField.value;\n\r";
		script += "}\n\r";
		CSManager.RegisterStartupScript(this.GetType(), "RetrieveScrollPosition",script, true);
	}									//end if
}

<asp:Panel ID="panel_contents" Height="175" Width="800" runat="server" ScrollBars="Vertical" ViewStateMode="Enabled" EnableViewState="True">
</asp:Panel>
<asp:HiddenField ID="vertscrollposition" runat="server" />