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We used to save our application or user settings in an INI file (dark ages) or more recently in XML files using our own code or classes borrowed from other developers. NET framework using Visual Studio can take advantage of built-in tools to simplify or speed up access and saving of runtime values. C# code uses a slightly different syntax the concepts are similar.

Once common example is saving database connection string information in a configuration file so that it may be changed without need to recompile the application. The following examples are using Visual Studio 2008 and VB. The Basics Each value you want to use in your application is defined as simple name=value pairs and saved in special XML files.

Durante la edición se desplegara al usuario un cuadro de texto en donde podrá cambiar el nombre, pero los países estarán definidos en una lista desplegable desde la cual serán seleccionados. Mediante la propiedad Auto Generate Edit Button se indica que en la grilla estén definidos las opciones de edición, por lo tanto habrá ciertos eventos que será necesario agregar en el código.

Es muy importante tener en cuenta que la carga de la información de la grilla solo se realice una vez al inicio de la pagina.

Es por eso que el evento Load de la pagina define la carga de los datos de la grilla dentro del bloque Is Post Back, le cual tiene que estar negado, ya que solo durante la carga inicial del formulario será requerida esta operación.

La primer acción que se expone al usuario es la edición, que efectuara el cambio al edittemplate, pero antes ejecutara el evento: En este evento se recupera el id del contacto que representa la fila en edición, se cargan los ítems en el combo para esa fila, y por ultimo se asigna la selección del país que actualmente esta definido la entidad del contacto.

Definición del ejemplo El mismo consiste en una lista de contactos a los cuales se le podrá asignar el país de nacimientos.Delete a Record We can delete a record from the database table by clicking on the delete button that is in the Delete column of the Grid View.We first of all create a Stored Procedure that gets the Id of an employee as a parameter from the Grid View on whichever row the user clicked. In this event, first we get the datakey value that is the id of an employee of whichever row the user clicked and that id is passed as a parameter to the Stored Procedure. According to the above, in these three operations we use three events of the Grid View for each operation.Now we access this connection string on the page so we can open a connection with the relation database. The first one accesses the connection string and the other is for the SQL connection.Now we define a method for opening a connection with the relation database and returns a SQL connection object depending on the connection string that is passed as a parameter of the Sql Connection class constructor.

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