Share a dictionary within a C# windows form

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I have a form with a series of buttons. button4 has to load some data from Excel and store the information into a dictionary called dataMap

    private void button4_Click(object sender, EventArgs e) 
    {
        loadXL myMap = new loadXL();
        Dictionary<string, marketdata> dataMap = myMap.myDataLoader(Convert.ToDateTime(AsOfDate.Text),Convert.ToDouble(Underlying.Text));
    }

This code generates correctly the dictionary and all the data I need are stored in dataMap . Now the problem is that I need the information in the dictionary to be accessible when I click another button. In order to do that I have tried the following:

    public Dictionary<string, marketdata> button4_Click(object sender, EventArgs e) 
    {
        loadXL myMap = new loadXL();
        Dictionary<string, marketdata> dataMap = myMap.myDataLoader(Convert.ToDateTime(AsOfDate.Text),Convert.ToDouble(Underlying.Text));

        return dataMap;
    }

So the click button event now should return the dictionary dataMap . If I run this I get the following error:

'System.Collections.Generic.Dictionary Project2.myInputForm.button4_Click(object, System.EventArgs)' has the wrong return type

and it refers to the following line in the form designer:

    this.button4.Click += new System.EventHandler(this.button4_Click);

How can I handle this? Is there a quick way to make the dictionary built when clicking button4 accessible by other button clicks?

Thanks.

asked 42 secs ago

opt

9

Share a dictionary within a C# windows form