2 drop down list and calendar to display gridview in C#

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C#

I have simple booking ticketing system for my school project and am using windows form in asp.net. i have simple search where the person can input bickup, drop off and date. am using drop down list FOR bickup and dropoff and date normal calendar attached to text box. but i can't populate the gridview e.g bus rides available from one position to another in specific dates , like from A to B in 24 of August. my date i stored as date others Nvarchar. i can bind the drop down list but the search button shows nothing.
below is my front code and back-end code. please i need help am new to c# and coding in general.

<form id="form1" runat="server">
        <div>
            <asp:TextBox ID="tbdates" runat="server"></asp:TextBox>

            
            <asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
                 
            <asp:DropDownList ID="DropDownList1" runat="server">
            </asp:DropDownList>
   
            <asp:DropDownList ID="DropDownList2" runat="server">
            </asp:DropDownList>

        </div>
        <asp:Calendar ID="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged"></asp:Calendar>
        
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            CssClass="table table-hover table-striped">
            <Columns>
                <asp:BoundField DataField="BusNo" HeaderText="Bus Number" />
                <asp:BoundField DataField="date" HeaderText="Date" />
                <asp:BoundField DataField="Time" HeaderText="Time" />
                <asp:BoundField DataField="Bickup" HeaderText="Bick Up" />
                <asp:BoundField DataField="DropOff" HeaderText="Drop Off" />
                <asp:BoundField DataField="Fare" HeaderText="Fare" />
            </Columns>
            <HeaderStyle BackColor="#33CCFF" />
        </asp:GridView>
        <asp:Button ID="Button1" runat="server" Text="Button" />
        <br />
    </form>

What I have tried:

<pre> public partial class DriverDisplay : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                fill_DropDownList1();
                fill_DropDownList2();
            }

        }
        private void fill_DropDownList1()
        {
            try
            {
                SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings["MyDatabase1ConnectionString"].ConnectionString);

                string sql = "SELECT * FROM Ticket";
                SqlCommand cmd = new SqlCommand(sql, con2);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                adapter.Fill(dt);
                DropDownList1.DataSource = dt;
                DropDownList1.DataTextField = "Bickup";
                DropDownList1.DataValueField = "Bickup";
                DropDownList1.DataBind();
            }
            catch (Exception)
            {

            }
        }

        private void fill_DropDownList2()
        {
            try
            {
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["MyDatabase1ConnectionString"].ConnectionString);

                string sql = "SELECT * FROM Ticket";
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                adapter.Fill(dt);
                DropDownList2.DataSource = dt;
                DropDownList2.DataTextField = "Dropoff";
                DropDownList2.DataValueField = "DropOff";
                DropDownList2.DataBind();
            }
            catch (Exception)
            {

            }
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Calendar1.Visible = true;

           
        }

        protected void Calendar1_SelectionChanged(object sender, EventArgs e)
        {
            tbdates.Text = Calendar1.SelectedDate.ToShortDateString();
            Calendar1.Visible = false;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //DateTime date = Convert.ToDateTime(tbdates.Text);
            SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["MyDatabase1ConnectionString"].ToString());

            sqlcon.Open();

            string query = "select * from Ticket where date = @Date";
            SqlCommand cmd = new SqlCommand(query, sqlcon);
            SqlParameter date = cmd.Parameters.Add("@Date", SqlDbType.DateTime);
           
            SqlDataReader rdr = cmd.ExecuteReader();

            GridView1.DataSource = rdr;
            GridView1.DataBind();

            sqlcon.Close();

        }
    }
}