Cannot pass value betwen two webparts

Question

I got two webpart instances on page. I need to pass data from one webpart to other. Data that i need to pass will be loaded in CreateChildControls.

When i am debugging its looks like nothing is passed! For example i set Value = 10; And in other webpart i got aintValue = 0;

How to pass data properly?

protected override void CreateChildControls()
        {
            var aintValue = provider == null ? -1 : provider.Value;

            if (Mode == DepartmentAndLocationWebpartMode.Departments)
            {
                this.Value = 10;
            }
            else
            {

            }
        }

        [ConnectionProvider("Provider of data to skip news.", "SkipNewsProvider")]
        public ISkipNewsProvider SkipNewsProvider()
        {
            return this;
        }

        protected ISkipNewsProvider provider;

        [ConnectionConsumer("Consumer of news to skip.", "SkipNewsConsumer")]
        public void SkipNewsConsumer(ISkipNewsProvider Provider)
        {
            provider = Provider;
        }

Answer 1

Do you have an interface, a provider and a receiver?

If so you then you connect the receiver and provider through the web part menu of the provider web part.

public interface example
{
    string foo { get; set; }
}

public class Provider : WebPart, example
{
    //webpart components

    public string bar
    {
        get{return _bar;}
        set{_bar = value;}
    }      

    protected override void CreateChildControls()
    {
        // Some control creation stuff
    }
    protected override void Render(HtmlTextWriter writer)
    {
        // Might want to override the renderer 
    }
    // Button events etc ie to set bar to the input text

    [ConnectionProvider("example provider")]
    public example ProvideCommunication()
    {
        return this as example;
    }  
  }

public class Consumer : WebPart
{
    private example providerWebPart;

    [ConnectionConsumer("example consumer")]
    public void ReceiveName(example provider)
    {
        providerWebPart = provider;
    }
    protected override void Render(HtmlTextWriter writer)
    {
        // Write out the value
        if (providerWebPart != null)
            writer.Write(providerWebPart.bar);
        base.Render(writer);
    }
}

I had to rip this out of one I had made and cut out all the gubbins, but I left the core parts there for you.

Answer 2

please refer to my answer in this post as its got all the info you need to make a connectable webpart in detail!

Connectable WebPart Problems......................?

and

Connection between 2 web parts

and

how to have connectable web part on two pages?

hope it helps :)