Amazon Cognito and ASP.NET C# Integration

Question

Hello, I am trying to implement cognito user pool into my login, register and logout and I have tried this code for Signup protected void Button1_Click( object sender, EventArgs e) { AddCognitoUser(); } static async Task AddCognitoUser() { string username = "Name" ; string password = "Password" ; string phonenumber = "+678172932" ; string email = "email@gmail.com" ; AmazonCognitoIdentityProviderClient provider = new AmazonCognitoIdentityProviderClient( new Amazon.Runtime.AnonymousAWSCredentials()); SignUpRequest signUpRequest = new SignUpRequest(); signUpRequest.ClientId = "clientid" ; signUpRequest.Username = username; signUpRequest.Password = password; AttributeType attributeType = new AttributeType(); attributeType.Name = "phone_number" ; attributeType.Value = phonenumber; signUpRequest.UserAttributes.Add(attributeType); AttributeType attributeType1 = new AttributeType(); attributeType1.Name = "email" ; attributeType1.Value = email; signUpRequest.UserAttributes.Add(attributeType1); try { SignUpResponse result = await provider.SignUpAsync(signUpRequest); } catch (Exception e) { System.Diagnostics.Debug.WriteLine(e); } } When i run these codes, there is an error saying "An unhandled exception of type 'System.NullReferenceException' occurred in mscorlib.dll" and i tried to find but there is nothing null in the codes. Is there anything that i do wrong? Or is there any other better tutorial that help to integrate cognito with asp.net c#? Any help will be really helpful. Thank You.

Sachin Singh · Answer

follow below steps for signup step 1.Store info in appSettings (web.config) . . . "AWSRegion" value= "eu-west-1" /> "CLIENT_ID" value= "XXXXXXXXXXXXXXXXXXXXXXXXXX" /> "USERPOOL_ID" value= "REGION_XXXXXXXXX" /> "IDENITYPOOL_ID" value= "REGION:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXX" /> "IDENITY_PROVIDER" value= "cognito-idp.REGION.amazonaws.com/" /> step 2.Create a Class public class CognitoUser : IdentityUser { public string Password { get; set; } public UserStatusType Status { get; set; } } Step 3.Create a SignUp class like below using Amazon.CognitoIdentityProvider; using Amazon.CognitoIdentityProvider.Model; public class CognitoUserStore : IUserStore , IUserLockoutStore , IUserTwoFactorStore { private readonly AmazonCognitoIdentityProviderClient _client = new AmazonCognitoIdentityProviderClient(); private readonly string _clientId = ConfigurationManager.AppSettings[ "CLIENT_ID" ]; private readonly string _poolId = ConfigurationManager.AppSettings[ "USERPOOL_ID" ]; public Task CreateAsync(CognitoUser user) { // Register the user using Cognito var signUpRequest = new SignUpRequest { ClientId = ConfigurationManager.AppSettings[ "CLIENT_ID" ], Password = user.Password, Username = user.Email, }; var emailAttribute = new AttributeType { Name = "email" , Value = user.Email }; signUpRequest.UserAttributes.Add(emailAttribute); return _client.SignUpAsync(signUpRequest); } }

Sachin Singh · Answer

install Install - Package Microsoft . AspNet . Identity . EntityFramework