// Creates an empty CodeAttributeDeclarationCollection.
CodeAttributeDeclarationCollection collection = new CodeAttributeDeclarationCollection();

// Adds a CodeAttributeDeclaration to the collection.
collection.Add( new CodeAttributeDeclaration("DescriptionAttribute",  new CodeAttributeArgument(new CodePrimitiveExpression("Test Description"))) );

// Adds an array of CodeAttributeDeclaration objects 
// to the collection.
CodeAttributeDeclaration[] declarations = { new CodeAttributeDeclaration(), new CodeAttributeDeclaration() };
collection.AddRange( declarations );

// Adds a collection of CodeAttributeDeclaration objects 
// to the collection.
CodeAttributeDeclarationCollection declarationsCollection = new CodeAttributeDeclarationCollection();
declarationsCollection.Add( new CodeAttributeDeclaration("DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("Test Description"))) );
declarationsCollection.Add( new CodeAttributeDeclaration("BrowsableAttribute", new CodeAttributeArgument(new CodePrimitiveExpression(true))) );
collection.AddRange( declarationsCollection );

// Tests for the presence of a CodeAttributeDeclaration in 
// the collection, and retrieves its index if it is found.
CodeAttributeDeclaration testdeclaration = new CodeAttributeDeclaration("DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("Test Description")) );
int itemIndex = -1;
if( collection.Contains( testdeclaration ) )
    itemIndex = collection.IndexOf( testdeclaration );

// Copies the contents of the collection, beginning at index 0,
// to the specified CodeAttributeDeclaration array.
// 'declarations' is a CodeAttributeDeclaration array.
collection.CopyTo( declarations, 0 );

// Retrieves the count of the items in the collection.
int collectionCount = collection.Count;

// Inserts a CodeAttributeDeclaration at index 0 of the collection.
collection.Insert( 0, new CodeAttributeDeclaration("DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("Test Description"))) );

// Removes the specified CodeAttributeDeclaration from 
// the collection.
CodeAttributeDeclaration declaration = new CodeAttributeDeclaration("DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("Test Description")) );
collection.Remove( declaration );

// Removes the CodeAttributeDeclaration at index 0.
collection.RemoveAt(0);