BindingNavigator - Disable delete button

[Nicklas]

Hi,

 

I'm currently using a dataentry connected to a bindingnavigator. I'm using the below code to check when the bindingsource collection change.

The goal is to disable the delete button in the bindingnavitor when the bindingsource collection has 1 item in it like shown below:

bs.ListChanged += (s, e) =>
                    {
                        int itemCount = Convert.ToInt32(bindingNavigator.BindingNavigatorElement.PageLabel.Text.Split(' ')[1]);
                        if (itemCount == 1)
                        {
                            bindingNavigator.BindingNavigatorElement.DeleteButton.Enabled = false;
                        }
                        else
                        {
                            bindingNavigator.BindingNavigatorElement.DeleteButton.Enabled = true;
                        }
                    };

 

However, I'm having a hard time disable the delete button. As seen in the ListChanged, I'm using below code to disable the button, but it seems that it has no effect at all. Am I doing something wrong?

bindingNavigator.BindingNavigatorElement.DeleteButton.Enabled = false;

[Dess | Tech Support Engineer, Principal]

Hello, Nicklas,   

The provided code snippet for disabling the delete button looks OK. However, after it is being executed, the UpdateDeleteButtonVisibility method of the RadBindingNavigatorElement is internally performed and updates the Enabled property back to true. You can use the following approach: 

        private void RadForm1_Load(object sender, EventArgs e)
        { 
            this.categoriesTableAdapter.Fill(this.nwindDataSet.Categories);

            this.bindingSource1.DataSource = this.categoriesBindingSource;

            this.radDataEntry1.DataSource = this.bindingSource1;
            this.radBindingNavigator1.BindingSource = this.bindingSource1;

            this.bindingSource1.ListChanged += bindingSource1_ListChanged;
        }

        private void bindingSource1_ListChanged(object sender, ListChangedEventArgs e)
        {
            if (this.bindingSource1.Count == 1)
            {
                this.radBindingNavigator1.BindingNavigatorElement.DeleteButton.Enabled = false;

                this.radBindingNavigator1.BindingNavigatorElement.DeleteButton.EnabledChanged += DeleteButton_EnabledChanged;
            }
        }

        private void DeleteButton_EnabledChanged(object sender, EventArgs e)
        {
            this.radBindingNavigator1.BindingNavigatorElement.DeleteButton.Enabled = false;
            this.radBindingNavigator1.BindingNavigatorElement.DeleteButton.EnabledChanged -= DeleteButton_EnabledChanged;
        }

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik