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C# Textbox validation should only accept integer values, but allows letters as well


C# Textbox validation should only accept integer values, but allows letters as well

By : SmarterThanYogi
Date : November 20 2020, 07:00 PM
hope this fix your issue You didn't specify where this code runs, but my assumption would be it runs on key down. Since key down is received before the character is processed and the Text property is updated, your check for .Text == "" will prevent the rest of the validation running, at least for the first character.
You should move the check for empty value on a different event than the check for the key pressed.
code :


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asp.net validation to make sure textbox has integer values

asp.net validation to make sure textbox has integer values


By : user1455179
Date : March 29 2020, 07:55 AM
I wish this helpful for you If all that you are concerned about is that the field contains an integer (i.e., not concerned with a range), then add a CompareValidator with it's Operator property set to DataTypeCheck:
code :
<asp:CompareValidator runat="server" Operator="DataTypeCheck" Type="Integer" 
 ControlToValidate="ValueTextBox" ErrorMessage="Value must be a whole number" />
<asp:RangeValidator runat="server" Type="Integer" 
MinimumValue="0" MaximumValue="400" ControlToValidate="ValueTextBox" 
ErrorMessage="Value must be a whole number between 0 and 400" />
How to make an integer validation function that does not accept floating point values?

How to make an integer validation function that does not accept floating point values?


By : RajneeshSinha
Date : March 29 2020, 07:55 AM
With these it helps Parse the whole line and make sure you've consumed the whole line.
With iostreams:
code :
#include <iostream>
#include <sstream>
#include <string>

for (std::string line; std::getline(std::cin, line); )
{
    std::istringstream iss(line);
    int result;

    if (!(iss >> result >> std::ws && iss.get() == EOF))
    {
        // error, die. For example:

        std::cout << "Unparsable input: '" << line << "'\n";
        continue;
    }

    // else use "result"
}
#include <errno>
#include <cstdlib>

char const * input = line.c_str();   // from above, say
char * e;
errno = 0;

long int result = std::strtol(input, &e, 10);

if (e == input || *e != '\0' || errno != 0)
{
    // error
}
Email validation with validation on username to accept only letters, digits, underscore and DOT

Email validation with validation on username to accept only letters, digits, underscore and DOT


By : user3449495
Date : March 29 2020, 07:55 AM
I hope this helps . I know this question asked many times but I could not find any solution to my specific validation. , You can do:
code :
if (!preg_match('/^(?!.*?\.\.)[\w.]+@(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]+$/', $email)) 
    return("Invalid email address"); 
How to restrict textbox in html to only accept letters with space?

How to restrict textbox in html to only accept letters with space?


By : Andrey Andreev
Date : March 29 2020, 07:55 AM
it fixes the issue I want to restrict textbox to only accept letters with spaces. I have tried this but it is not accepting spaces , You are missing the anchors and quantifiers:
code :
pattern="^[A-Za-z \s*]+$"
Textbox only accept digits, letters and back space; the 1st character entered for the textbox cannot be a digit

Textbox only accept digits, letters and back space; the 1st character entered for the textbox cannot be a digit


By : Anel Belkozhayeva
Date : March 29 2020, 07:55 AM
Any of those help The most likely reason why your code is not working is because you've omitted the handles clause of your KeyPress event:
code :
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Mask: A09999
A: Required one alphabetical letter (a-z or A-Z).
0: Required one digit (0-9)
9: Up to four optional digits (0-9)
Dim r As New System.Text.RegularExpressions.Regex("[a-zA-Z]\d{1,5}")
If r.IsMatch(TextBox1.Text) Then
   '... proceed
Else
   'Invalid input
End If
[a-zA-Z]: Match any letter a-z regardless of case
\d{1, 5}: Match atleast one and up to five digits
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