?
Solved

How do I check to see the value (if its empty or not) in TextBox1 from my class file (ASP.Net, C#)

Posted on 2012-12-22
4
Medium Priority
?
476 Views
Last Modified: 2012-12-23
I would like to make a static class that check to see if  a checkbox has something in it or not. And if  it does, I want to execute my code.  I just don’t know how to check the textbox

public class costCL
{
    
    public double rs;
   
    public void Add(double c, double s, double st)
	{
        if(don't know what goes here)
            double ftax = 5.00; 
            
            rs = Math.Round(c + s + st + ftax, 2);
    }
         

Open in new window

0
Comment
Question by:bmanmike39
4 Comments
 
LVL 18

Expert Comment

by:Jerry Miller
ID: 38716167
You can use the IsNullOrEmpty method to check the value.

If Not String.IsNullOrEmpty(TextBox.Text) then
execute your code


http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx
0
 

Author Comment

by:bmanmike39
ID: 38716329
I don't know how to access the text box from my class file
0
 
LVL 16

Accepted Solution

by:
Vikram Singh Saini earned 2000 total points
ID: 38716590
Hi,

Please check link: http://www.vss-tech.com/access-page-control-from-class-file-in-app_code/

to see how to access text box from .aspx page in class file(.cs) from App_Code.

Let us know if you face any problem.
0
 
LVL 19

Expert Comment

by:Manoj Patil
ID: 38717584
Hey, if you want to restrict the user to enter the value in textbox then you can use regular expression n your .aspx page
Try it your self here
http://www.w3schools.com/aspnet/showasp.asp?filename=demo_reqfieldvalidator

Or you can check it by using java-script


function msgBox(objtxt)

{
var objtxt=document.getElementById('<%=TextBox2.ClientId%>');
if (objtxt.value.length == 0)

{
alert('TextBox shouldnot be empty');

objtxt.focus();

}

}



<asp:TextBox ID="TextBox2" onkeyup ="msgBox(this);" runat="server"></asp:TextBox><br />
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
Simulator games are perfect for generating sample realistic data streams, especially for learning data analysis. It is even useful for demoing offerings such as Azure stream analytics, PowerBI etc.
this video summaries big data hadoop online training demo (http://onlineitguru.com/big-data-hadoop-online-training-placement.html) , and covers basics in big data hadoop .
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
Suggested Courses
Course of the Month9 days, 12 hours left to enroll

612 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question