How to convert userinput date and time via textbox with use of ajaxMaskedEidtExtendor to C# code DateTime Format

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C#

ASP.NET

Ajax

DateTime

I have datetime input textboxes for StartDate and EndDate by using asp:TextBox with ajaxtoolkit maskeditextender. Enddate is as same as StartDate code. Here is the code.

<asp:TextBox ID="txtStartDateTime" runat="server"></asp:TextBox>
<ajaxToolkit:MaskedEditExtender ID="MaskedEditExtender1"
    TargetControlID="txtStartDateTime"  runat="server" Mask="99/99/9999 99:99"
    MessageValidatorTip="true" MaskType="DateTime"  ClearMaskOnLostFocus="true"
    ClearTextOnInvalid="true" AcceptAMPM="true" UserDateFormat="DayMonthYear"
    ErrorTooltipEnabled="True">
</ajaxToolkit:MaskedEditExtender>

<ajaxToolkit:MaskedEditValidator ID="MaskedEditValidator1"  runat="server" 
    ControlToValidate="txtStartDateTime" ControlExtender="MaskedEditExtender1"
    IsValidEmpty="false" EmptyValueMessage="Input Date and Time" 
    InvalidValueMessage="Date Time Input Not Valid">
</ajaxToolkit:MaskedEditValidator>

This is C# code behind to get date and time of userinput and save in database.

string strStartDateTime = txtStartDateTime.Text;
           DateTime dtStartingDateTime = new DateTime();
           dtStartingDateTime = DateTime.ParseExact(strStartDateTime, "dd/MM/yyyy HH:mm", System.Globalization.CultureInfo.InvariantCulture);

I am not passing at c# code. It shows error like this.

System.FormatException: String was not recognized as a valid DateTime.

at System.DateTimeParse.ParseExact(String s, String format, DateTimeFormatInfo dtfi, DateTimeStyles style)

at System.DateTime.ParseExact(String s, String format, IFormatProvider provider)

Can anyone help me how to fix. I googled the problem and no solution. Thank in advance.