How to specify application pool identity user and password from PowerShell

Question

I have been having lots of difficulty automating the setup of a Web application and configuring IIS appropriately with the Application Pool Identity. I am doing this in a Web a

Answer 1

After few experiments

Here is my Answer, I hope this will helps , I've worked on IIS 8.5

$credentials = (Get-Credential -Message "Please enter the Login credentials including Domain Name").GetNetworkCredential()

$userName = $credentials.Domain + '\' + $credentials.UserName

Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.identityType -Value SpecificUser 

Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.userName -Value $username

Set-ItemProperty IIS:\AppPools\$app_pool_name -name processModel.password -Value $credentials.Password