SharePoint : Connected Webparts

Creating connected webparts involves the below steps.

 
Create an Interface  

 
         public interface ITextBoxString
Create a property which would be returning a reference to the interface.
         public interface ITextBoxString
        {
            string TextBoxString { get; set; }
        }

Provider Webpart
 Implement the interface.

         public class StringProvider : WebPart, ITextBoxString

 
create a property which would be returning the interface reference decorate it with ConnectionProvider

         [ConnectionProvider("Provider for Text Value", "TextBoxStringProvider")]
         public ITextBoxString TextBoxStringProvider()
        {
            return this;
        }

 
Consumer web part
     It should contain the method which would receive the interface.The method should be decorated with ConnectionConsumer attribute.
     

          [ConnectionConsumer("String Consumer", "StringConsumer")]
          public void TextBoxStringConsumer(ITextBoxString Provider)
         {
            _myProvider = Provider;
         }

YOU ARE ALL SET!