How to Find Number of Days between Start and End Date in ASP.Net

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HTML

<div>
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td>
                Start Date
            </td>
            <td>
                <asp:TextBox ID="txtStartDate" runat="server" Text="04/06/2014" />
            </td>
        </tr>
        <tr>
            <td>
                End Date
            </td>
            <td>
                <asp:TextBox ID="txtEndDate" runat="server" Text="06/06/2014" />
            </td>
        </tr>
    </table>
    <table border="0" cellpadding="5" cellspacing="2">
        <tr>
            <td>
                DateTime days count without culture =
            </td>
            <td>
                <asp:Label ID="lblDaysCountWithoutCulture" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                DateTime days count with culture =
            </td>
            <td>
                <asp:Label ID="lblDaysCountWithCulture" runat="server" />
            </td>
        </tr>
    </table>
    <br />
    <asp:Button Text="Find Number of Days" runat="server" OnClick="DaysBetweenDates" />
</div>

Namespace

using System.Globalization;

C#

protected void DaysBetweenDates(object sender, EventArgs e)
{
    TimeSpan diff, diff1;
    // This will give you 61 days
    DateTime startDateWithoutCulture = DateTime.Parse(this.txtStartDate.Text);
    DateTime endDateWithoutCulture = DateTime.Parse(this.txtEndDate.Text);

    //This will give you correct answer.
    int days1 = 0, days2 = 0;
    DateTime startDateWithCultureInfo = Convert.ToDateTime(this.txtStartDate.Text, new CultureInfo("en-GB"));
    DateTime endDateWithCultureInfo = Convert.ToDateTime(this.txtEndDate.Text, new CultureInfo("en-GB"));
    if (endDateWithoutCulture > startDateWithoutCulture)
    {
        diff = endDateWithoutCulture.Subtract(startDateWithoutCulture);
        days1 = Convert.ToInt16(diff.Days);
    }

    if (endDateWithCultureInfo > startDateWithCultureInfo)
    {
        diff1 = endDateWithoutCulture.Subtract(startDateWithCultureInfo);
        days2 = Convert.ToInt16(diff1.Days);
    }
    this.lblDaysCountWithoutCulture.Text = days1.ToString();
    this.lblDaysCountWithCulture.Text = days2.ToString();
}

Screenshot