CODEWITHSUNDEEP
c#
Mano
Mano

Reputation: 445

how to Check datetime entered

I have a textBox where the user enters a datetime using a calendar, I am checking for whether the text box is empty or not by

       if ((string.IsNullOrEmpty(txt_SendAt.Text) == false)

How can I check whether the datetime entered is less or = to the current datetime

Upvotes: 0

Views: 594

Answers (7)

Hari Gillala
Hari Gillala

Reputation: 11916

if (!(string.IsNullOrEmpty(txt_SendAt.Text) && Datetime.Parse(txt_SendAt.Text)<=Datetime.Now)
{
   /*code */
}
else
{
   /*code */
}

Upvotes: 0

Oded
Oded

Reputation: 498992

Use one of the Parse or TryParse static methods of the DateTime class to convert the string to a DateTime and compare it to the current DateTime.

DateTime input;
if(DateTime.TryParse(txt_SendAt.Text, 
                     CultureInfo.InvariantCulture, 
                     DateTimeStyles.None, 
                     out input))
{
  if(input <= DateTime.Now)
  {
    // your code here
  }
}
else
{
 //not a valid DateTime string
}

Upvotes: 0

Daniel May
Daniel May

Reputation: 8226

You can parse your string input to a DateTime using the DateTime.Parse method, then run your comparison in the normal way.

Remember, Parse methods will throw a FormatException if the input is not directly castable to the required type. It may make more sense to go for the TryParse method if you have, for example, a free-text input.

var inputDate = DateTime.Parse(txt_SendAt.Text);
if (inputDate > DateTime.Now)
{
    Console.WriteLine("DateTime entered is after now.");
}
else if (inputDate < DateTime.Now)
{
    Console.WriteLine("DateTime entered is before now.");
}

Upvotes: 0

Grant Thomas
Grant Thomas

Reputation: 45083

A few steps here, first check something is entered, as you have done, secondly, check it is actually a date, and lastly check against the desired date, as such:

var input = DateTextBox.Text;
if (!string.IsNullOrEmpty(input))
{
    DateTime date;
    if (DateTime.TryParse(input, out date))
    {
        if (date <= DateTime.Now)
        {
            //bingo!
        }
    }
}

Notice the TryParse for checking proper formatting of the input string as a date - using only Parse is a sure way to make your app go BANG!

Upvotes: 0

sll
sll

Reputation: 62504

DateTime enteredDateTime;
if (!DateTime.TryParse(txt_SendAt.Text, out enteredDateTime))
{
   Debug.WriteLine("User entered date time in wrong format");
}else
{
   if(enteredDateTime <= DateTime.Now)
   {
      // less or equal
   }
}

Upvotes: 1

Dennis Traub
Dennis Traub

Reputation: 51634

Parse or TryParse the text to DateTime, then compare to DateTime.Now

Upvotes: 0

Bala R
Bala R

Reputation: 108957

 if ((string.IsNullOrEmpty(txt_SendAt.Text) == false 
             && DateTime.Parse(txt_SendAt.Text) <= DateTime.Now )

Upvotes: 1

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