To delete all resources in a management group in Microsoft Azure, you can use the Azure PowerShell module or the Azure CLI.

Azure PowerShell and Azure CLI are command-line tools that you can use to manage resources in Azure. They provide a set of commands that you can use to create, configure, and delete resources in Azure.

Azure PowerShell is a module for Windows PowerShell that provides cmdlets for managing Azure resources. It is built on top of the .NET Framework and is optimized for managing resources in Azure. Azure CLI is a cross-platform command-line tool that you can use to manage Azure resources. It is built on top of the Azure Management Libraries and is available for Windows, Linux, and macOS.

You can use either tool to perform a wide range of tasks in Azure, such as creating and managing virtual machines, creating and managing storage accounts, and deploying and managing web applications. Both tools are free to use and are available for download from the Azure website.

Method 1: Here is an example of how to do it using Azure PowerShell:

1. First, install the Azure PowerShell module by following the instructions here: https://docs.microsoft.com/en-us/powershell/azure/install-az-ps?view=azps-2.8.0

2. Connect to your Azure account using the Connect-AzAccount cmdlet:

Connect-AzAccount

1. Get a list of all resources within the management group using the Get-AzResource cmdlet. You can filter the list by resource type, resource group, or other parameters. For example, to get a list of all resources within the management group:

    $resources = Get-AzResource -ManagementGroupName <management group name>

1. To delete all resources in the list, you can use a loop and the Remove-AzResource cmdlet. Here is an example of how to do it:

foreach ($resource in $resources) {
  Remove-AzResource -ResourceId $resource.ResourceId -Force
}

1. You can also use the -WhatIf parameter to preview the resources that would be deleted without actually deleting them.

Method 2: Here is an example of how to do it using Azure CLI:

1. First, install the Azure CLI by following the instructions here: docs.microsoft.com/en-us/cli/azure/install-..

2. Connect to your Azure account using the az login command:

        az login

1. Get a list of all resources within the management group using the az resource list command. You can filter the list by resource type, resource group, or other parameters. For example, to get a list of all resources within the management group:

            az resource list --management-group <management group name>

1. To delete all resources in the list, you can use a loop and the az resource delete command. Here is an example of how to do it:

for resource in $(az resource list --management-group <management group name> --query "[].id" -o tsv)
do
    az resource delete --ids $resource
done

1. You can also use the --no-wait parameter to delete the resources asynchronously.

Note: Deleting resources can have unintended consequences and may cause disruptions to your services. It is recommended to carefully plan and test any changes to your resources before making them in a production environment.