How to parse a Date
DateTime tg2 = DateTime.Parse(txtTG2.Text, System.Globalization.CultureInfo.CreateSpecificCulture("en-US"));
How to parse date in a textBox using a calendar
<asp:TextBox ID="txtTG4" runat="server" Text="" CssClass="capture" Style="width: 75px;" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" ControlToValidate="txtTG4" runat="server" ErrorMessage="*Required" CssClass="validator" ValidationGroup="save" />
<ajaxCTK:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtTG4" PopupPosition="TopLeft" />
<ajaxCTK:MaskedEditExtender ID="mskTg4" runat="server" Mask="99/99/9999" MaskType="Date" CultureName="en-US"
TargetControlID="txtTG4" ErrorTooltipEnabled="true" AutoComplete="false">
</ajaxCTK:MaskedEditExtender>
<ajaxCTK:MaskedEditValidator ID="MaskedEditValidator5"
runat="server" ValidationGroup="save"
ControlExtender="mskTg4"
ControlToValidate="txtTG4"
InvalidValueMessage="Date is invalid"
IsValidEmpty="True" />
