String was not recognized as a valid DateTime.

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Error---String was not recognized as a valid DateTime.

design part

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head  runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1"  runat="server">
    <div>
        <cc1:ToolkitScriptManager ID="ToolkitScriptManager1"  runat="server">
        
    <table width="50%" align="center">
        <tr>
            <td align="right">
                 </td>
            <td>
                </td>
            <td>
                 </td>
            <td>
                 </td>
        </tr>
        <tr>
            <td align="right">
                <asp:Label ID="lblstart" runat="server" Font-Bold="True" Text="StartDate:">
            </td>
            <td>
                 </td>
            <td>
                <asp:TextBox ID="txtstart" runat="server">
                <cc1:CalendarExtender ID="CalendarExtender1"  runat="server" TargetControlID="txtstart">
                
            </td>
            <td>
                 </td>
        </tr>
            <%--<tr>
                <td align="right">
                    Upload Image:</td>
                <td>
                     </td>
                <td>
                    <asp:FileUpload ID="fileuploadimages" runat="server" />
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td align="right">
                    Enter Image Desc</td>
                <td>
                     </td>
                <td>
                    <asp:TextBox ID="txtDesc" runat="server">
                </td>
                <td>
                     </td>
            </tr>--%>
            <tr>
                <td align="right">
                    <asp:Label ID="lblEnd" runat="server" Font-Bold="True" Text="EndDate:">
                </td>
                <td>
                     </td>
                <td>
                    <asp:TextBox ID="txtEnd" runat="server">
                    <cc1:CalendarExtender ID="CalendarExtender2"  runat="server" TargetControlID="txtEnd" >
                    
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td align="right">
                     </td>
                <td>
                     </td>
                <td>
                    <asp:Label ID="diffrence" runat="server">
                </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td>
                     </td>
                <td>
                     </td>
                <td>
                    <asp:Button ID="btncreat" runat="server" onclick="btncreat_Click" 
                        Text="Submit" />
                </td>
                <td>
                     </td>
            </tr>
    </table>
    
    </div>
    </form>
</body>
</html>

code --

C#

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btncreat_Click(object sender, EventArgs e)
    {
        int Totaldays = duration(txtstart.Text, txtEnd.Text);
        diffrence.Text = Convert.ToString(Totaldays);
    }

    public int duration(string startdate, string enddate)
    {
        DateTime dt1 = DateTime.Parse(Convert.ToDateTime(txtstart.Text).ToString("dd/MM/yyyy"));
        DateTime dt2 = DateTime.Parse(Convert.ToDateTime(txtEnd.Text).ToString("dd/MM/yyyy"));
        TimeSpan ts = dt2.Subtract(dt1);
        int days = ts.Days;
        return days;


    }
}

Posted 7-Apr-13 21:00pm

Raj@88

Updated 7-Apr-13 21:04pm

Vani Kulkarni

v2

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Comments

Naz_Firdouse 8-Apr-13 3:12am

Please check these links
http://www.codeproject.com/Questions/397301/String-was-not-recognized-as-a-valid-DateTime
http://www.codeproject.com/Questions/418140/String-was-not-recognized-as-a-valid-DateTime

3 solutions

Solution 3

use this

FromDate = DateTime.ParseExact(txtFromDate.Text.ToString(), "dd/MM/yyyy", null);
ToDate = DateTime.ParseExact(txtToDate.Text.ToString(), "dd/MM/yyyy", null);

Posted 7-Apr-13 21:26pm

PRAKASH9

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navin ks · Accepted Answer · 2013-04-07T21:16:00

Solution 1

try
<cc1:calendarextender id="CalendarExtender2" runat="server" targetcontrolid="txtEnd" format="dd/MM/yyyy"

Posted 7-Apr-13 21:16pm

navin ks

Updated 7-Apr-13 21:17pm

v2

Pallavi Waikar · Accepted Answer · 2013-04-07T21:23:00

try this code..

public int duration(string startdate, string enddate)
   {
       DateTime dt1 = DateTime.Parse(Convert.ToDateTime(txtstart.Text).ToString("MM/dd/yyyy"));
       DateTime dt2 = DateTime.Parse(Convert.ToDateTime(txtEnd.Text).ToString("MM/dd/yyyy"));
       TimeSpan ts = dt2.Subtract(dt1);
       int days = ts.Days;
       return days;


   }