validate textbox to enter number from only particular range of numbers

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4.33/5 (2 votes)

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In my window application i have many text box and i want to enter a number from particular range of values like 1, 2, 4 ,8, 11, 56, 78. i am able to validate single digit numbers, but unable to do with two digit number. how can i validate from only those numbers. please can you help me

Posted 22-Jan-14 1:18am

Satya52

Updated 22-Jan-14 1:58am

Karthik_Mahalingam

v2

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Comments

Dinesh.V.Kumar 22-Jan-14 7:28am

Is this range of numbers finalized?
If yes then have the numbers in a list [arrays, arraylist, or generic list]. when the user enters a value in the textbox, check the value is available in this list. If the value is available then allow the user to proceed else show an error message.

Hope this helps

Regards
Dinesh Kumar.V.

Karthik_Mahalingam 22-Jan-14 7:31am

post your code..

3 solutions

Solution 1

Try this...
Range Validation from 0 to 78..

C#

public static bool IsValidNo(string inputNo)
{
    string strRegex = @"^(?:\d|[1-3]\d|7[0-8])$";
    Regex re = new Regex(strRegex);
    if (re.IsMatch(inputEmail))
        return (true);
    else
       return (false);
}

For more refer this link

Posted 22-Jan-14 1:54am

V5709

Updated 22-Jan-14 1:59am

v4

Solution 4

Try following code on textBox keypress event

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
       {
           //textBox1 allows only range from 0 to 50  ****************
           try
           {
               double dVal = Convert.ToDouble(textBox1.Text.Trim().Insert(textBox1.SelectionStart, ((char)e.KeyChar).ToString()));
               if (dVal < 0 || dVal > 50)
               {
                   e.Handled = true;
                   return;
               }
           }
           catch
           {
               //skip
               return;
           }
           //************************************
       }

Posted 22-Jan-14 2:09am

RhishikeshLathe

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Karthik_Mahalingam · Accepted Answer · 2014-01-22T02:05:00

Solution 3

Try this

If you want to validate only fixed values this will be enough

C#

private static bool ValidateFixedNumbers(int number)
   {
       int[] numbers = { 1, 2, 4, 8, 11, 56, 78 };
       return numbers.Contains(number);
   }

with in a range , you can use this.

C#

private static bool ValidateInRange(int from, int to, int number)
{
    return System.Linq.Enumerable.Range(from, to).Contains(number);

}

Posted 22-Jan-14 2:05am

Karthik_Mahalingam

Comments

Satya52 22-Jan-14 8:32am

it's working. thank you

Karthik_Mahalingam 22-Jan-14 8:53am

welcome satya :)