Time Display To the Textbox

Dropdownlist Binding

 static int i;

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {

                for (i = 1; i < 12; i++)

                {

                    DropDownList1.Items.Add(new ListItem(i.ToString(), i.ToString()));

                }

                for (int j = 1; j < 60; j++)

                {

                    DropDownList2.Items.Add(new ListItem(j.ToString(), j.ToString()));

                }

            }

Time display to the textbox

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

        {

            ViewState["Time1"] = DropDownList1.SelectedItem.Text;

            ViewState["Time2"] = ViewState["Time2"] = Convert.ToBoolean(null) ? "" : ViewState["Time2"];

            //ViewState["Time3"] = ViewState["Time3"] = Convert.ToBoolean(null) ? "" : ViewState["Time3"];

           TextBox1.Text = ViewState["Time1"].ToString() + ":" + ViewState["Time2"] + " " + ViewState["Time3"];

        }

       

        

        protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)

        {

            ViewState["Time2"] = DropDownList2.SelectedItem.Text;

            ViewState["Time3"] = ViewState["Time3"] = Convert.ToBoolean(null) ? "" : ViewState["Time3"];

            TextBox1.Text = ViewState["Time1"].ToString() + ":" + ViewState["Time2"].ToString() + " " + ViewState["Time3"];

          

        }

        

        protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)

        {

            ViewState["Time3"] = DropDownList3.SelectedItem.Text;

            TextBox1.Text = ViewState["Time1"].ToString() + ":" + ViewState["Time2"].ToString() + " " + ViewState["Time3"];

        }