Questions tagged as 'c#'

Tagged questions
2
answers

Entity Framework create field Image

I am working with Entity Framework code first I have the need to create an image field in SQL Server. What I'm trying to do with EF is to create an Image field in the database. public byte[] Imagen { get; set; } Product ClassMap Property...
asked by 05.07.2016 / 17:58
2
answers

Call an attribute from one class to another to make a ValidationResult

I am looking for ways to validate my model with entity framework , and with validationResult I can achieve it, but with only one class, what do you propose to call another class and validate? an attribute of that kind? Example: public IE...
asked by 22.11.2016 / 17:52
1
answer

Calculate tan-1 in angles c #?

I'm trying to do the following calculation but nothing works for me The calculation of tan-1(1) the result of the calculator is 45 grados but I can not obtain this result in C #. Code: Math.Tanh(1);// resultado = 0,...
asked by 12.10.2018 / 05:42
1
answer

MySQL does not return data in a column

I have a database where sometimes there is no data in some columns, I would like to know how I could know that this column is null . I've tried with if(!_Rellenar.HasRows) { isNull = false; } And with: if(!_Rellenar.Read()) {...
asked by 14.10.2018 / 23:05
1
answer

Return a list of an object

I have the following model with a method to retrieve a list of data of the same model. public class Totem { public int Id { get; set; } public string Dato1{ get; set; } public string Dato2 { get; set; } public string Dato3 { ge...
asked by 28.08.2018 / 21:25
1
answer

OLEDB conection goes down when processing a large number of files

I have a problem with oledb in C # turns out that it is a console that reads files .xlsx of a folder (170 files in total) but when it goes in reading No. 120 it falls and the error is "Unknown" OleDbConnection Econ; Econ = new OleDbConnection(...
asked by 10.09.2018 / 22:57
1
answer

Error retrieving cell value in GridView

I am carrying out a program so that certain students can choose their project, however, in order for the student to correct or change a member of his team, he must delete his own or his partner's registration before registering in the database....
asked by 10.09.2018 / 08:18
1
answer

How to modify background image of a web app after having done deployment?

I did the deployment of a web app, and I realized that the background image that I put in the body makes it difficult to read the content, so I want to change it, and try to do the publish and rebuild again but it has not worked that way. <...
asked by 23.08.2018 / 16:05
1
answer

last question id inserted (mysql)

Hello, good morning, everyone. I need to make an insert to an X table and immediately make an insert in an Xx table. The insert to the first table works without problems, but the particularity that the second insert has as key the ID th...
asked by 24.08.2018 / 15:52
2
answers

Web Api ASP.NET can not find the method

By consuming the API created in asp.net with postman I get the following error {"Message": "No se ha encontrado ningún recurso HTTP que coincida con la URI de la solicitud 'http://localhost:9401/api/Usuarios/Login'.", "MessageDetail": "No se e...
asked by 22.08.2018 / 22:28