listbox selectedvaluechanged event fires programmaticlly !!! [modified]

[Hussam Fattahi]

I'm populating a listbox using it's DataSource property in form's load event what happens is that the selectedValueChanged event or selectedIndexChanged fires twice when starting the form how can i prevent such behaviour i want the event to fire only when user change listbox by mouse there is an event straight for this(SelectionChangeCommitted), but it's availabe only on combbox control i need to use listbox for htis. how can i achive such behaviour secondly: when i first run the form, the selectedValueChanged event always fired once again selecting the firs index in the listbox how to stop this also i want to run the form without any event being fired unless the user change the value manually thanks

modified on Tuesday, October 27, 2009 7:04 AM

[Henry Minute]

Your ListBox is behaving as designed and as far as I am aware it is not possible to stop it. However one of the many ways to cope with the problem is as follows: 1) Modify the Constructor for your Form

private bool stillInitializing = false;    //<========== NEW CODE ===================
public MyForm()
{
    this.stillInitializing = true;    //<========== NEW CODE ===================

    InitializeComponent();

    this.stillInitializing = false;    //<========== NEW CODE ===================
}

2. Modify your event handler(s)

   private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
   {
   if (this.stillInitializing)
   {
   return;
   }

    // your code goes here
   

   }

Hope this helps! :)

Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.”

[Hussam Fattahi]

didn't work when applied on form construcor so i tried this

private void Form1_Load(object sender, EventArgs e)
{
this.stillInitializing = true; //NEW CODE

        unitMeasureCollection.GetMulti(null);
        vendorCollection.GetMulti(null);
        shipMethodCollection.GetMulti(null);
        purchaseOrderDetailCollection.GetMulti(null);

        /\*PredicateExpression filter = new PredicateExpression(UnitMeasureFields.UnitMeasureCode == "BOX");
        unitMeasureCollection1.GetMulti(filter);
        \*/

        comboBoxUnitMeasure.DataSource = unitMeasureCollection;
        comboBoxUnitMeasure.ValueMember = "UnitMeasureCode";

        listBoxVendor.DataSource = vendorCollection;
        listBoxVendor.DisplayMember = "Name";
        listBoxVendor.ValueMember = "VendorID";

        listBoxShipMethod.DataSource = shipMethodCollection;
        listBoxShipMethod.DisplayMember = "Name";
        listBoxShipMethod.ValueMember = "ShipMethodID";

        dataGridView1.DataSource = purchaseOrderDetailCollection;

        PopulateCategoriesAndSubCategories();

        //To clear textboxes affected by lisbox event that fired automatically
        ClearTextBoxes();
        DisableButtons();

        this.stillInitializing = false;                                       //NEW CODE
    }

and it worked just fine thanks, Henry Minute :)

[Henry Minute]

Good stuff! :thumbsup: It is nice to attempt to help someone with the intelligence to see the basis of your answer and apply it for their own circumstances. :)

Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.”