Adding List Item to DropDownList using for loop in ASP.Net

Hi akhter,

Please take reference to the below code and correct your code.

HTML

<asp:DropDownList ID="ddlMonths" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlMonths_SelectedIndexChanged">
    <asp:ListItem Value="Jan" Text="Jan"></asp:ListItem>
    <asp:ListItem Value="Feb" Text="Feb"></asp:ListItem>
    <asp:ListItem Value="Mar" Text="Mar"></asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>

Code

C#

protected void ddlMonths_SelectedIndexChanged(object sender, EventArgs e)
{
    String Mon;
    Mon = ddlMonths.SelectedItem.Text;

    int noofday;

    if (Mon.ToUpper() == "FEB")
    {
        noofday = 28;
    }
    else
    {
        noofday = 31;
    }
    DropDownList2.Items.Clear();
    for (int j = 1; j <= noofday; j++)
    {
        DropDownList2.Items.Add(new ListItem(j.ToString(), j.ToString()));
    }
}