Technologies
Today in
Engineer's World, we are discussing a C# query faced by a developer in very
easy way. Posted By- +Manish Kumar Gautam +LIVE VIAR +ASP.NET SOLUTIONS
Calling .cs (class file) from .aspx.cs (webform code behind file) in Asp.net C#
For that, we have to call the validate.cs file method in
Practical Implementation:
Calling .cs (class file) from .aspx.cs (webform code behind file) in Asp.net C#
We have
already prepared our web form and validation class logic in our previous two
blogs.
Inference
from our previous blogs, all we need is to call our validation class method
into our web form.
For that, we have to call the validate.cs file method in
calling_cs_page_from_aspxcs.aspx.cs
web form file. And this calling need to be done on click of button event.
Practical Implementation:
Code
Behind code:
using System; -----> Namespace
public partial class calling_cs_page_from_aspxcs : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
//using and creating
the object of validation.cs class
Validation isValid = new Validation(); //isValid-> object of
Validation class
/* Here, isValid (object of Validation
class) has a method checkName which is taking the name. So, we need to pass
that name (entered from textbox) onto the method parameter. And also this
method (checkName) is returning output in string. This means, we need to store
the output in string. So, we take string variable 'msg' to store the result. */
string msg =
isValid.checkName(txtName.Text);
if (msg.Trim().Length != 0)
{
lblmsg.Text = msg;
lblmsg.Visible = true;
}
else
{
lblmsg.Text = "Name validate
successfully.";
lblmsg.ForeColor =
System.Drawing.Color.Green;
lblmsg.Visible = true;
}
}
}
Press
Ctrl+Shift+B. As the output, message shows build succeeded. Press Ctrl+F5.
It will Run the website locally.
You can check
all the three cases:
A) Case
1: When we do not
enter anything in the name text box. And click on the submit button. We got a
label message - which says - "Enter Name". One more thing to note
down is the message is in red color, implies it is a validation alert message,
means this field is required, we cannot submit a blank name in the 'Name'
field.
B) Case
2: When we input more
than 15 characters in the name text box. And click on the submit button. We
again got a label message - which says - "Name length cannot be greater
than 15 characters" in Red color. Again an alert message.
C) Case
3: When we input the
appropriate name with less than 15 characters. It is accepted. Hence, giving a
success message in green color.
This demo
shows - how we can call a function from class (.cs) file present in some
different location into a web form (.aspx.cs) which is also present in some
different location.
Related Questions:
Q-1 What will be the correct output for the given code snippet?
class maths
{
int fact(int n)
{
int result;
if (n == 1)
return 1;
result = fact(n - 1) * n;
return result;
}
}
class Output
{
static void main(String args[])
{
maths obj = new maths() ;
Console.WriteLine(obj.fact(4)*obj.fact(2));
}
}
A) 60
B) 64
C) 120
D) 48
C) 120
D) 48
Ans. Option(D)
Explanation- 4! = 4*3*2*1 & 2! = 2*1 .So, 24*2 = 48.
Output- 48
Explanation- 4! = 4*3*2*1 & 2! = 2*1 .So, 24*2 = 48.
Output- 48
Q-2
What is output of the code?
static void Main(string[] args)
{
m();
Mul();
Console.ReadLine();
}
static void Mul()
{
Console.WriteLine("4");
}
static void m()
{
Console.WriteLine("3");
Mul();
}
A) 4 3 4
B) 4 4 3
C) 4 3 3
D) 3 4 4
D) 3 4 4
Ans. Option(D)
Explanation- First m() will be executed to print the number ‘3’ and at last mentioned function Mul() will be executed to print the statement 4. Second, Mul() will be executed to print the number ‘4’ to return the output as 3 4 4.
Output- 4 3 4.
Explanation- First m() will be executed to print the number ‘3’ and at last mentioned function Mul() will be executed to print the statement 4. Second, Mul() will be executed to print the number ‘4’ to return the output as 3 4 4.
Output- 4 3 4.
Keep learning and sharing…
