from1 contains a variable "Admin_id" n it becomes null when i code form1 f1 = new form1(); why?

Question

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from1 contains a variable "Admin_id" n i declare it like this

private string admin_id;
public string Admin_id
{
     get { return admin_id; }
     set { admin_id = value; }
}

it becomes null when i code

form1 f1 = new form1();

why?

i write this in Administration class to access value of form1 variable (admin_id) n to access i code

string d_id = f1.Admin_id;

Posted 16-Jun-11 9:24am

Sweety Khan

Updated 17-Jun-11 3:09am

v3

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Comments

Sergey Alexandrovich Kryukov 16-Jun-11 15:26pm

Where is the declaration of A_TB1?
--SA

Sweety Khan 16-Jun-11 15:28pm

it is a textbox. i just drop it in my from n use it as A_TB1.text

4 solutions

Solution 1

replace

admin_id. = A_TB1.Text;

with this:

string admin_id = A_TB1.Text;

for further queries comment here!!

Posted 16-Jun-11 9:30am

Uday P.Singh

Comments

Sweety Khan 16-Jun-11 21:28pm

yes i defined it like this so tht i can access it in other classes too
private string admin_id;
public string Admin_id
{
get { return admin_id; }
set { admin_id = value; }
}

Ajvirk 16-Jun-11 21:51pm

r u getting the value in the database I mean in table u created at databadse?

Sweety Khan 17-Jun-11 9:11am

@Ajvirk: i edit the question, plz read n then again ask me

Solution 3

Your public property is null because you've never initialised it with a value.

Based on your code, try doing the following:

form1 f1 = new form1();
f1.Admin_id = "someAdminId";
string d_id = f1.Admin_id;

You can see that Admin_id now holds someAdminId.

Posted 17-Jun-11 3:24am

UJimbo

Comments

Sweety Khan 17-Jun-11 9:30am

sorry i didnt mention it in my ques tht Admin_id is initialized like this in form1.
Admin_id = A_TB1.Text;

UJimbo 17-Jun-11 10:55am

Might I suggest then that you create an event for your A_TB1 textbox On TextChanged where you give the value of your textbox to to the public property like:
private void A_TB1_TextChanged(object sender, EventArgs e)
{
Admin_id = A_TB1.Text;
}

On your Administration class, create the variable like so:
string d_id = string.Empty;

Finally, create a method on your Administration class that does what you tried to do above:

public string UpdateValue()
{
return f1.Admin_id;
}

Call the above method whenever you want to get the latest value from your textbox, like d_id = UpdateValue();

Hope I was helpfull

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nit_singh · Accepted Answer · 2011-06-17T03:22:00

Solution 2

Admin_id is a public variable on the form1, so whenevr you create a new instance of the form then automatically all the variables are reinitialized

Posted 17-Jun-11 3:22am

nit_singh

Comments

Sweety Khan 17-Jun-11 9:24am

oki but i want its value :(. how to get it?

Rajesh Lagaria · Accepted Answer · 2011-06-17T04:44:00

Solution 4

for Public type variables use class and define like this :-

C#

public static string Admin_id;

uses :

C#

string ID=classname.Admin_id;

Posted 17-Jun-11 4:44am

Rajesh Lagaria

Comments

Sweety Khan 17-Jun-11 12:22pm

done! thanx a lot from core of my heart.