Updating an item in the DynamoDB table using the AWS SDK for .Net

Let's understand how to update an item from the DynamoDB table using the AWS SDK for .Net.

Getting ready

To perform this operation, you can use the IDE of your choice.

How to do it…

Let's try to understand how to update a stored item in the DynamoDB table using .Net. The update request allows us to add a new attribute to the item, update the value of an attribute, or remove an attribute from the item:

1. Create an instance of the DynamoDB client:

   AmazonDynamoDBClient client = new AmazonDynamoDBClient();
   string tableName = "productTable";

2. Create the update table request and specify the details of the attributes that you wish to update. Here, I want to add an attribute called rating with the value as 5, update/reduce the value of stock by 2, and remove the mnfr attribute from that item, whose primary key id is 10 and the type phone:

   var request = new UpdateItemRequest
   {
       TableName = tableName,
       Key = new Dictionary<string,AttributeValue...