Question

I’ve added a LINQ-SQL link in my website to make objects and after that, I’m trying to write the neccesary code to search into a database.

In my case I am trying to display a column value assigned to another of other column into a DATABASE using the following code but I can’t:

Palabras_Definiciones quintanaserena = new Palabras_Definiciones(); // LINQ

if (searchInput.Attributes["value"] == quintanaserena.palabra)
{
    Label1.Text = quintanaserena.definición;
}

Am I doing anything wrong?

Answer 1

In the code above, you are not doing any request to the database. You only created the object that has the same definition as your database table.

To query your database, you need to do a query over your DataContext (usually the name of your .dbml file).
MSDN has a good web page to show sample of query. You might want to take a look there: http://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b

Your query would probably look like:

palabrasDataContext dcPalabras = new palabrasDataContext();    //palabrasDataContext would be the name of the DataContext you generated
Palabras_Definiciones quintanaserena = (from palabras in palabrasDataContext
                                        where palabras.palabra == searchInput.Attributes["value"]   //palabra is the name of the column
                                        select palabras).FirstOrDefault();                 //Using firstorDefault here if you have only one definition per word

if(quintanaserena != null)       //FirstorDefault returns null if the resultset was empty
{
    label1.Text = quintanaserena.definición;
}