how to check the text box value is in date format or not

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Actually i am for my text box i am implimenting the ajax calender so the text in the text box is text or date i want find. if it is text means i want to display popup. is it possible

first i want to know how to give the condition

But now i am using this condition

C#

if ( txtAppDate.Text.ToString() == "")
                {
                    string radalertscript1 = "<script language='javascript'>function f(){alert('Please select the Appointment Date ', 330, 210,'My Title'); Sys.Application.remove_load(f);}; Sys.Application.add_load(f);</script>";
                    Page.ClientScript.RegisterStartupScript(this.GetType(), "radalert", radalertscript1);
                    return;
                }

Posted 17-Jul-13 21:02pm

ntitish

Updated 17-Jul-13 21:06pm

v3

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Dholakiya Ankit 18-Jul-13 3:08am

in javascript?

2 solutions

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Zafar A khan · Answer 1 · 2013-07-17T21:08:00

Solution 1

use RegularExpressionValidator and capture the isValid property if it is valid then it is date if Invalid then it is text.

Posted 17-Jul-13 21:08pm

Zafar A khan

Comments

ntitish 18-Jul-13 3:25am

can u give any sample example.....

Zafar A khan 18-Jul-13 3:32am

check this
http://stackoverflow.com/questions/4284280/date-regular-expression-validator
http://sandblogaspnet.blogspot.com/2009/04/calling-validator-controls-from.html

ntitish 18-Jul-13 3:39am

sir can i use this sir,

try
{
txtDt.Text = Convert.ToDateTime(txtDt.Text).ToString("dd-MMM-yyyy");
}
catch (Exception eee)
{
txtDt.Text = "";
}
if (txtDt.Text.Trim() == "")
{
ClientScript.RegisterStartupScript(GetType(), ClientID, "alert('Enter Valid Date');", true);
return;
}

Zafar A khan 18-Jul-13 3:48am

DateTime mydate = null;
if (DateTime.TryParse(txtDt.Text, out mydate))
{
}
else {
ClientScript.RegisterStartupScript(GetType(), ClientID, "alert('Enter Valid Date');", true);
}

ntitish 18-Jul-13 3:56am

Cant i check in first if statement itself sir........

Zafar A khan 18-Jul-13 3:58am

yes you can like this
DateTime mydate = null;
if (!DateTime.TryParse(txtDt.Text, out mydate))
{
ClientScript.RegisterStartupScript(GetType(), ClientID, "alert('Enter Valid Date');", true);
}

ntitish 18-Jul-13 3:59am

can not convert null to system datetime error is showing in first line
DateTime mydate = null;

Zafar A khan 18-Jul-13 4:01am

initialze mydate (i-e)
DateTime mydate = DateTime.Now.Date;
if (!DateTime.TryParse(txtDt.Text, out mydate))
{
ClientScript.RegisterStartupScript(GetType(), ClientID, "alert('Enter Valid Date');", true);
}

ntitish 18-Jul-13 4:04am

that means if i enter any date in the text box present date,past date,future date also it will take na sir......

Zafar A khan 18-Jul-13 4:07am

yes. but it should be date. if not date will give you an alert message

ntitish 18-Jul-13 4:10am

Actually i am taking text box date through ajax calender when i am converting that text box value into date time it is giving error

ntitish 18-Jul-13 4:09am

Sir how can i convert that text box value into date time

Zafar A khan 18-Jul-13 4:12am

you don't need to convert it the converted value will be stored in mydate object ... you can check the documentation of DateTime.TryParse

ntitish 18-Jul-13 4:22am

Sir if u dont mind can u see my code below

DateTime mydate = DateTime.Now.Date;
if (DateTime.TryParse(txtAppDate.Text, out mydate))
{
string radalertscript1 = "<script language='javascript'>function f(){alert('Please select the Appointment Date ', 330, 210,'My Title'); Sys.Application.remove_load(f);}; Sys.Application.add_load(f);</script>";
Page.ClientScript.RegisterStartupScript(this.GetType(), "radalert", radalertscript1);
return;
}

if (txttime.Text.ToString() == "")
{
string radalertscript1 = "<script language='javascript'>function f(){alert('Please select the Appointment Date ', 330, 210,'My Title'); Sys.Application.remove_load(f);}; Sys.Application.add_load(f);</script>";
Page.ClientScript.RegisterStartupScript(this.GetType(), "radalert", radalertscript1);
return;
}
string cmdText = "";

DateTime dt = Convert.ToDateTime(txtAppDate.Text);
DateTime tm = Convert.ToDateTime(txttime.Text);
DateTime fdt = Convert.ToDateTime(dt.ToShortDateString() + " " + tm.ToShortTimeString());

if (txtAppDate.Text.ToString() != "")
{
cmdText = "Update RefMst set ApptNotes='" + txtAppNotes.Text.Trim() + "' ,RefStatus='Scheduled', AptTime='" + fdt + "',AptWith='"
+ cmbPhy1.SelectedItem.Text + "',AptWithUserID='" + cmbPhy1.SelectedValue + "' where Pri_ID='" + Session["Pri_ID"] + "'";

}

Sergey Alexandrovich Kryukov · Answer 2 · 2013-07-17T21:24:00

Solution 2

In both JavaScript or .NET, it's the best to just try to parse string into date/time and see if it fails or not.

—SA

Posted 17-Jul-13 21:24pm

Sergey Alexandrovich Kryukov

Comments

ntitish 18-Jul-13 3:26am

sir can u give any example for my above code......

ntitish 18-Jul-13 3:38am

Sir can i use this ha sir

try
{
txtDt.Text = Convert.ToDateTime(txtDt.Text).ToString("dd-MMM-yyyy");
}
catch (Exception eee)
{
txtDt.Text = "";
}
if (txtDt.Text.Trim() == "")
{
ClientScript.RegisterStartupScript(GetType(), ClientID, "alert('Enter Valid Date');", true);
return;
}

Sergey Alexandrovich Kryukov 18-Jul-13 10:27am

Why "Convert"? You need DateTime.Parse... TryParse/ParseExact/TryParseExact.
Don't use "", use string.Empty.
Even if this is work, I suspect you tent to use strings representing data, not data itself (System.DateTime). Don't "convert" string to string. Always work with data. Strings are only needed on the very end of output: to show on screen, etc.
—SA