CODEWITHSUNDEEP
c#winforms
athosbr99
athosbr99

Reputation: 483

How to update a ComboBox from a window when closing another window?

First of all, I want to apologize for:

That said, let's go to the issue.

I have this window:

pretty window

If I click the button marked in red:

look the red thing

This will open:

the other window

This is supposed to be a software for a market. The first window is responsible to order more thing to the inventory. The second window is responsible to add a supplier into the system.

The combobox shows all the suppliers on the system. I want when I finish adding a supplier on the second window after I clicked on the button highlighted with the red rectangle, the combobox will update automatically with the new data.

I used a "Update" button with this code:

this.tb_FornecedorTableAdapter.Fill(this.tccDataSet.tb_Fornecedor);

It worked, but I tried to use on FormClosing, FormClosed and Deactivate events on the other windows and it didn't work at all (I modified the "this" on the code to a lot of this and it didn't help me). Is there a way to do what I want?

Upvotes: 4

Views: 1905

Answers (3)

igesan
igesan

Reputation: 66

If the ComboBox is updated with the data from SQL Server then you can try this:

// When button Adicionar is clicked
private void buttonAdd_Click(object sender, EventArgs e)
{
    using(Form formAdd = new Form()) // This is the Gerenciar Fornecedor form
    {
        formAdd.ShowDialog(this); // Show the form. The next statement will not be executed until formAdd is closed
        // Put the your code to update the ComboBox items here
    }
}

Upvotes: 2

Ivan.Yu
Ivan.Yu

Reputation: 594

In the first window declare a public methord:

public void RefreshCombo()
{
this.tb_FornecedorTableAdapter.Fill(this.tccDataSet.tb_Fornecedor);
}

Then in the first window add button click event

WindowB window=new WindowB(this);
WindowB.Show();

Then in the child window add a ctor method:

private WindowA windowParent;

public WindowB(WindowA parent)
{
InitializeComponent();
this.windowParent=parent;     
}

In WindowB FormClosing Event

this.windowParent.RefreshCombo()

Upvotes: 2

Szymon
Szymon

Reputation: 43023

What you can do in this case is to add a property on the child form to store the combo box value and populate it when the combo box value changes. Also, create a method on the child form that will be called from the parent form. It will show the child form and return the combo box value.

public partial class ChildForm : Form
{
    public ChildForm()
    {
        InitializeComponent();
    }

    private string _comboValue { get; set; }

    public string ShowAndGetComboValue()
    {
        this.ShowDialog();

        return _comboValue;
    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        _comboValue = comboBox1.SelectedItem.ToString();
    }
}

On the parent form, you can then display the child form this way:

ChildForm form = new ChildForm();
string comboValue = form.ShowAndGetComboValue();

Upvotes: 1

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