Check Textbox value is Date or not.

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Hello Every one,

I am using c#. i have textbox in which i add calender extender of ajax.
I want to check that enter value in textbox is date or any simple text.

But i don't know what code will be used?

Please help me.

I want to validate that value entered in textbox is date or not?

Posted 23-May-12 3:13am

coolnavjot31

Updated 23-May-12 18:57pm

v2

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3 solutions

Solution 1

Here is what you put in the button:

HTML

<input type="submit" id="btnSubmit" value="Submit" onClick="return Validate();"/>

Javascript

JavaScript

<script type="text/javascript">
<!--

 function Validate()
 {

  var intFlag = 0;
  var strErrMsg = "Please complete the following field(s):\n\n";

  var dtDate= document.getElementById("tbDate").value; // tbDate = name of text box
  var currentDate= getCalendarDate()


  if (dtDate > currentDate )
  {
   strErrMsg = strErrMsg + "your custom error message \n";
   intFlag++;
  }

    // Display error message if a field is not completed
  if (intFlag != 0)
  {
   alert (strErrMsg);
   return false;
  }
  else
   return true;

 }

//-->
</script>

Posted 23-May-12 3:15am

Prasad_Kulkarni

Solution 2

in c#

you can use
Convert.ToDateTime(txtDate.Text)
with in a try - catch statement

if error then you can blank textbox

C#

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;
}

Posted 23-May-12 19:04pm

Technoses

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Rajesh Kariyavula · Accepted Answer · 2012-05-23T19:27:00

Solution 3

You can try this, if you want to do it at Server Side

DateTime curDate = DateTime.Now;
if (DateTime.TryParse(ToDate, out curDate))
{
\\Your Code goes here
}

Hope this helps.

Posted 23-May-12 19:27pm

Rajesh Kariyavula

Comments

coolnavjot31 24-May-12 1:37am

Hello Rajesh,

I have also found another solution.

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;
}

Rajesh Kariyavula 24-May-12 1:54am

I'm happy that you found multiple solutions. But I'm not comfortable with the above code.
Exception is catched and not handled properly. Its a good practice to handle n log the exceptions.

Convert.ToDateTime(txtDt.Text).ToString("dd-MMM-yyyy");
ToString will not handle null, if the txtDt.Text is null, an exception is fired.

And date format is hardcoded, which is not a good practice.

And if (txtDt.Text.Trim() == "") . Please avoid too much code and especially conditional code blocks(if they can be avoided).

Hope you will get it

coolnavjot31 24-May-12 2:10am

thanks rajesh !