Access object from another button click event [duplicate]

Question

I'm fairly new to C# so this might be pretty simple actually though I have spent a couple hours searching without a solution.

I'm working with windows form and I am trying to access an object from another button-click event. The error I'm getting is "The name 'object' does not exist in the current context" when trying to access object in Button2_Click.

    public void Button1_Click(object sender, EventArgs e)
    {
        // Prefilled with a persons info
        MyClass object = new MyClass();
    }

    public void Button2_Click(object sender, EventArgs e)
    {
        // Access object
        string name = object.Name;
    }

So my question is how do I access an object created in another "Button_Click"?

You've defined object in a function scope so it's got garbage collected after the function code is executed. You might want to define it in class scope instead. More information here — Fabjan
– Fabjan, Commented Feb 14, 2018 at 17:47

Greg · Accepted Answer · 2018-02-14 17:49:41Z

1

A couple of issues exists.

You can't use object as variable name. (object is a reserved keyword)
You can't access a internal variable, within another event.

To solve your issue, you would scope the variable when your initial object is created.

public class Example
{
     // Variable declared as a class global.
     private readonly Sample sample; 

     // Constructor to build our sample.
     public Example() => sample = new Sample(); 

     // Button writing a property from sample.
     protected void btnSend(object sender, EventArgs e) => Console.WriteLine(sample.SomeProperty); 
}

So the object is in the upper portion of your class, when you build Example, a sample is always created. So as you utilize Sample within your Example class, it will be correctly scoped.

I also don't understand why you have to click one button, to populate this object, so I altered to have the object built once Example is created.

answered Feb 14, 2018 at 17:49

Greg

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2 Comments

Camilo Terevinto Over a year ago

c# 6 syntax might be confusing for someone who is just getting started with c#

Greg Over a year ago

@CamiloTerevinto Fair enough, I use the shorthand quite a bit. Second nature to me at this point.

FaizanHussainRabbani · Accepted Answer · 2018-02-14 17:52:30Z

0

The scope of the object should be class level in order to be used by other methods in the same class:

private MyClass _myClassObject; // class level object. Remember "object" is reserved keyword that is why renamed it to "_myClassObject"
public void Button1_Click(object sender, EventArgs e)
{
        // Prefilled with a persons info
        _myClassObject = new MyClass();
}

public void Button2_Click(object sender, EventArgs e)
{
    // Access object
    string name = _myClassObject.Name;
}

edited Feb 14, 2018 at 17:52

answered Feb 14, 2018 at 17:46

FaizanHussainRabbani

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