This is the code I have but not sure if I'm doing this right using a LINQ query, Get error on index 'EditProfileController.Index()': not all code paths return a value FE', and on db 'The name db does not exist in the current context'. i am getting repeated results why is that? I'm not sure how much crystal clear you need me to be. 7. This is a general C# error. I am seeing a list now. Execute the SQL statement and store in a list. Create Your First ASP.NET Core Project Design View Page Step 2. Use a projection query to populate the ViewModel. Right click on the Controllers folder and make a new MoviesController. Is this error coming from the model or view? Why do I get two different answers for the current through the 47 k resistor when I do a source transformation? By using this website, you agree with our Cookies Policy. How do you create a dropdownlist from an enum in ASP.NET MVC? Asp.Net MVC Get (Display) Data from Database using ADO.NET, retrieve or read Since your method GetAllObjectsAsync is so generic, you probably won't be able to add the .Include () you need. I am trying to loop through the data in the user model navigation property but i am getting an error that its returning null. I am trying to retrieve data from the database and populate the records in a table, but i am getting an error An exception of type 'System.NullReferenceException' occurred in App_Web_14paz0pq.dll but was not handled in user code specify the controller name as Home with suffix controller. The content you requested has been removed. MD. Next, we examined how you can test the contents of View Data. Notice how the schema of the Movies table maps to the Movie class you created earlier. Hi Peter Cong, Actually,where such many records is stored is a stress.. 1.Once the user's browser is set to not support cookies, then our session will have no way to use it. Add Entity Framework reference from NuGet package manager. As per your description , you got error'The name db does not exist in the current context'. 3. Stack Overflow for Teams is moving to its own domain! To View data in the database first we have to create a Controller file. How do I simplify/combine these two methods? like you normally would: 4 5 So do I need to include all of the declared from the model in the View? What should I do? Import the binding object of model class at the top of Index View and access the properties by @Model. Next step is to add a View for the Controller and while adding you will need to select the PersonModel class created earlier. View. below, to our Create new class in model [that should be the table structure] 4. Most tutorials should show using dependency injection but you could start maybe with a class level declaration for now if new as well with dependency injection. ASP.NET Web API is a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. The above method gets thedbobject that is nothing but the ApplicationDbContext (ADO.NET Entity Framework)object and calls the PersonalDetails (this is the property in the IdentityModel.cs of ApplicationDbContext You can download this excel file by clicking here. - and as always in C# you can't use a variable if it is not declared (and instanciated). Select Movie (MvcMovie.Models) for the Model class. How many characters/pages could WordStar hold on a typical CP/M machine? Database Some coworkers are committing to work overtime for a 1% bonus. You can verify that it's been created by looking in the App_Data folder. Sir , i got a error : An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user codeAdditional information: Procedure or function 'usercrudoperation' expects parameter '@username', which was not supplied.in that line : da.Fill(ds);Can you please help me !!! We will be using Model for the below database table where AutoId is the auto increment field. Did you use, where i suppose to write this line of code and i guess that's the answer. rev2022.11.3.43003. Remaining fields are self-explanatory. Lets add some records in the database directly as shown in the following screenshot. View Controller Model @ { Layout = null; } <!DOCTYPE HTML> <html> <head> <script> window.onload = function () { Create New ASP.NET CORE project UserProfile with No Authentication. Making statements based on opinion; back them up with references or personal experience. Just for the experience purpose, if i had a ID for each record is this how i select a distinct record ` var Movies = (from movie in db.Movies select movie).Distinct().ToList();` where would i place ID so that it selects distinct record based on id? What are MVP and MVC and what is the difference? Non-anthropic, universal units of time for active SETI. Connect and share knowledge within a single location that is structured and easy to search. It's FREE! Right-click the Movies table and select Edit Table Schema. Make a wide rectangle out of T-Pipes without loops. I want to upload excel file and import data to sql server database table. I get another error 'InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'System.Collections.Generic.List`1[System.String]', but this ViewDataDictionary instance requires a model item of type 'System.Collections.Generic.IEnumerable`1[FE.Models.AspNetUsers]'. Here it is likely your intent is to return full user details so on the controller side it would be rather : How do you handle multiple submit buttons in ASP.NET MVC Framework? Item - contains string. The 2 choices for the result of this query are either going to be NULL or the name of the column name you are searching for SQL In the Add Scaffold dialog box, click MVC 5 Controller with views, using Entity Framework, and then click Add. Check my code shown below. Step 1: Before we proceed for any of the steps, your need to create a ASP.NET MVC sample project in your Visual Studio, so navigate to File-> New -> Project-> Select "Web . Using the same model that was used for the first way to do the binding . Now, let's try to use GET in MVC application. Does activating the pump in a vacuum chamber produce movement of the air inside? Would it be illegal for me to act as a Civillian Traffic Enforcer? 4. The HttpGet action method Edit () will fetch student data from the database, based on the supplied Id parameter and render the Edit view with that particular Student data. the required formal parameter 'options' of 'ApplicationDbContext.ApplicationDbContext(DbContextOptions)', Do I need to declare something for ApplicationDbContext. next step on music theory as a guitar player. here is code : // GET data from stored procedure public ActionResult InsertUserDetails() { UserDetails objuser = new UserDetails(); DataSet ds = new DataSet(); using (SqlConnection con = new SqlConnection()) { using (SqlCommand cmd = new SqlCommand("usercrudoperation", con)) { con.ConnectionString = WebConfigurationManager.ConnectionStrings["mycon"].ToString(); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@status", "GET"); con.Open(); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); // got error in that line List userlist = new List(); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { UserDetails uobj = new UserDetails(); uobj.userid = Convert.ToInt32(ds.Tables[0].Rows[i]["userid"].ToString()); uobj.username = ds.Tables[0].Rows[i]["username"].ToString(); uobj.education = ds.Tables[0].Rows[i]["education"].ToString(); uobj.location = ds.Tables[0].Rows[i]["location"].ToString(); userlist.Add(uobj); } objuser.userinfo = userlist; } con.Close(); } return View(objuser); }, Make changes in below procedure like thisCreate Procedure usercrudoperations(@name varchar(50)=null,@education varchar(50)=null,@location varchar(50)=null,@status varchar(10))AsBEGIN-- Insert User Detailsif @status ='INSERT'BEGININSERT INTO userdetails(username,education,location)VALUES(@name,@education,@location)END-- Get User Detailsif @status ='GET'BEGINSELECT * FROM userdetailsENDEND, still get error on this lineda.Fill(ds); please help. Please check your cshtml C# code. Should 'using' directives be inside or outside the namespace? Units - contains values of type int. The error is very specific. Lets add some data in the following field. You don't actually need to add the EmpDBContext connection string. using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; type to aDateTimeOffset explicitly in the projection query. A potentially dangerous Request.Form value was detected from the client. It has 7 columns: 1. 1 Answer. Your code is not crystal clear but I'll assumeAspNetUsers is a ViewModel that you created. Download source - 4.4 MB; Introduction. Third way to Binding Dropdownlist. GET call to Controller's Method that will return . connection string name should be matches with the given context [in this Example EmployeeContext ] 5. Right-click on the Employees table and select the View data menu option. Create new project. Create Controller Fourier transform of a functional derivative. In this chapter, we will see how to use a database engine in order to store and retrieve the data needed for your application. Sorry forgot to change the result type to match the projection. If so I don't need all of those from the models to show on the View so how do i get around that. Agree Given example shows Column chart rendered using data from database. For the value of the input to be submitted as form data, it needs to have a name attribute. and write the code like as shown below, Html.DisplayFor(modelitem By using. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I changed that line to UserName = user.UserName thinking it needs to match the case in the model but that gave a error to the entire list of properties. This creates a normal view of List type that lists the data from PersonaldetailsFilesViewModel view model. To upload file on the server or insert images into the database in Spring MVC application, these following steps need to be followed. Click Next button to show Site Information for project. I'd suggest a separate method GetAllUsers() to your repository - possibly the concrete UserRepository, if you have that: Thanks for contributing an answer to Stack Overflow! Download and install Northwind Database Entity Framework Model Once the Entity Framework is configured and connected to the database table, the Model will look as shown below. window will open in that enter the name of controller and click Add like as shown This returns all records from the PersonalDetails database table and convert them into List and returns to theView. Given the number of posts I believe you are experienced with C# but new to MVC ? Security=true;Initial Catalog=MySamplesDB", i = 0; i < CREATE TABLE [dbo]. controller to insert or get data from database for that right click on application to define properties in our application for that right click on, Once the required formal parameter 'options' of 'ApplicationDbContext.ApplicationDbContext(DbContextOptions)'. An explicit conversion exists (are you missing a cast?)' I'd suggest a separate method GetAllUsers () to your repository - possibly the concrete UserRepository, if you have that: public async Task<IEnumerable<User>> GetAllUsersAsync () { var getUsers = await _Context.Users.Include . In this article we will see how to read data from SQL Server database using MVC Design pattern. GetAllEmployees (GET ) GetEmployeeById (POST ) which takes id as input parameter Register your database credentials like URL, username, and password. Step 2 Create a list variable for Customer class and assign data into the list in "Demo" controller. Artifact: LearnSpringMVCWithRealApps. Get property value from string using reflection, Error: model item passed into the dictionary is of type '.List', but this dictionary requires a model of type 'IEnumerable`, Binding Gridview with drop down list selection MVC 5. ds.Tables[0].Rows.Count; i++), If you observe above Lets expand this database and you will see that it has one table which contains all the fields we have in our Employee model class. Now we need to update the EmployeeController.cs file so that we can actually save and retrieve data from the database instead of using hardcoded data. Step 6 : Start writing code to model. Why is proving something is NP-complete useful, and where can I use it? You will see that we have no records at the moment. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you don't see the Movies.mdf file, click the Show All Files button in the Solution Explorer toolbar, click the Refresh button, and then expand the App_Data folder. https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/. Is there a way to make trades similar/identical to a university endowment manager to copy them? Injecting content into specific sections from a partial view ASP.NET MVC 3 with Razor View Engine. There is not enough information to determine your intention. Should I use LINQ and if so what am I missing from my code above? i don't understand why it does recognize UserName even though Refresh the browser and you will see that data is now updated to the view from the database. Our hosted Web API REST Service includes these two methods, as given below. What should that be set to in the controller? How can a GPS receiver estimate position faster than the worst case 12.5 min it takes to get ionospheric model parameters? Now lets go the SQL Server Object Explorer and refresh the database. Another mistake on my part, C# is case sensitive. This file use Entity Framework interact with the database. Before we proceed to insert or get data from If you don't specify a connection string, Entity Framework will create localDB database in the users directory with the fully qualified name of the DbContext class. Lets go to the SQL Server Object Explorer, you will see the database is created with the same name as we have in our DBContext class. Leave the default name ( BookStoreWithData.Models.BookStoreWithDataContext) Click Add. ), Interview Questions in ASP.NET, C#, VB.NET, SQL, .NET Framework, Simple login form example in asp.net Check Username and Password availability in database, Asp.net insert, Edit, update, delete data in gridview, 3 tier architecture example in asp.net with C#, Introduction to Object Oriented Programming Concepts (OOPS) in C#.net, OOPS (Object Oriented Programming) Concepts in C#.NET with Examples, Best Login Page Design in HTML, CSS with Source Code, C# - Constructors in C# with Example, Types of Constructor in C# with Example, how to insert images into database and how to retrieve and bind images to gridview using asp.net (or) save and retrieve images from database using asp.net, Introduction to WCF - WCF tutorial | WCF Tutorial - Windows Communication Foundation | WCF Example | WCF Sample code in asp.net 3.5 | Basic WCF Tutorial for Beginners.
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