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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
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);
}
[X]
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4 Comments
You can use the IsNullOrEmpty method to check the value.
If Not String.IsNullOrEmpty(TextB
execute your code
http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx
If Not String.IsNullOrEmpty(TextB
execute your code
http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx
Active 6 days ago
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.
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.
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.getElement
if (objtxt.value.length == 0)
{
alert('TextBox shouldnot be empty');
objtxt.focus();
}
}
<asp:TextBox ID="TextBox2" onkeyup ="msgBox(this);" runat="server"></asp:TextB
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.getElement
if (objtxt.value.length == 0)
{
alert('TextBox shouldnot be empty');
objtxt.focus();
}
}
<asp:TextBox ID="TextBox2" onkeyup ="msgBox(this);" runat="server"></asp:TextB
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