use of calendar in mysql db

hi guys for take date i have 1 textbox :
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> cmd.Parameters.AddWithValue("@CreatedDtTm", TextBox2.Text); above code is inserting date in 2014-05-06 in this format in database.
I just want to use calender in above situation.
suggest