How to read aws sam parameter in .NET lambda function

I have a SAM template that takes parameters in the .yml file, and I want to access the parameter value within the lambda function written in c#

here is the SAM template

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >      
Globals:
  Function:
    Timeout: 60
    Runtime: dotnetcore2.1
Parameters: 
  ApiBaseUri: 
    Type: String
    Default: https://postb.in/1584332032935-8906962152104
    Description: The API URL where the received events will be pushed by the lambda function
Resources:
  PushUpdates:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./src/PushAPIs/
      Handler: Localgov.Microservices::LambPaymentTracker.UpdateHandler::PushBurtonUpdates
      Runtime: dotnetcore2.1
      Policies: AWSLambdaDynamoDBExecutionRole
      Events:
        Stream:
          Type: DynamoDB
          Properties:
            Stream: !GetAtt UpdatesTable.StreamArn
            BatchSize: 100
            StartingPosition: TRIM_HORIZON

Solution

The common way of passing cloudformation (or sam) variables to lambda would be through Environment Variables.

In your template you specify the variables using Environment property.

In your code, you then use your programming language specific functionality to read them.