Bind ASP.Net AJAX CalendarExtender from Database in ASP.Net

Here i am able to save the date.

Change your HTML for CalendarExtender

<asp:TextBox ID="txtShippedDateTime" runat="server" Width="190px"></asp:TextBox>
        <asp:ImageButton runat="Server" ID="ImgCal1" ImageUrl="calendar.png" AlternateText="Click to show calendar"
            OnClientClick="return false;" />
        <cc1:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtShippedDateTime"
            PopupButtonID="ImgCal1" Format="dd/MMM/yyyy" />
        <asp:Button ID="Button1" runat="server" OnClick="SaveDate" Text="Save
        Date" />

VB:

Protected Sub SaveDate(sender As Object, e As EventArgs)

        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Dim sqlStatment As String = "INSERT INTO DateTable(ShippedDate) VALUES(@ShippedDate)"
        Using con As New SqlConnection(constr)
            Using cmd As New SqlCommand(sqlStatment, con)
                cmd.Parameters.AddWithValue("@ShippedDate", Convert.ToDateTime(Me.txtShippedDateTime.Text))
                con.Open()
                cmd.ExecuteNonQuery()
                con.Close()
            End Using
        End Using
    End Sub