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Dataset object in ADO .NET
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The DataSet object is a disconnected storage.DataSet is a disconnected in-memory representation of data. It can be considered as a local copy of the relevant portions of the database. The DataSet is persisted in memory and the data in it can be manipulated and updated independent of the database. It represents related tables, constraints, and relationships among the tables. DataSet reads and writes data and schema as XML documents.The DataSet object is a disconnected storage.It is used for manipulation of relational data. The DataSet is filled with data from the storeWe fill it with data fetched from the data store. Once the work is done with the dataset, connection is reestablished and the changes are reflected back into the store.

ADO.NET DataSet can contain more than one table and also contains information about table relationships, the columns they contain, and any constraints that apply. Each table in a DataSet can contain multiple rows. Once data is retrieved from the database into a DataSet object, an application can disconnect from the database before processing the DataSet. This is an important feature of the ADO.NET DataSet. It gives us an in-memory, disconnected copy of a portion of the database which we can process without retaining an active connection to the database server.

Creating and using a DataSet

The typical steps in creating and using a DataSet are:

    (i)Create a DataSet object
    (ii) Connect to a database
    (iii)Fill the DataSet with one or more tables or views
    (iv)Disconnect from the database
    (v)Use the DataSet in the application

Example of DataSet

 

using System;
using System.Data;
using System.Data.SqlClient;
public class empcount {
public static void Main() {
//change the following connection string, as necessary...
string con ="server=(local)\kamal;
  database=Emp;trusted_connection=yes";
DataSet ds = new DataSet("EmpDataSet");
SqlDataAdapter sad;
string sl;
sl = "SELECT COUNT(*) AS cnt FROM employee";
sad = new SqlDataAdapter(sl, con);
sad.Fill(ds, "emp_count");
sl = "SELECT COUNT(*) AS cnt FROM compocation";
sad = new SqlDataAdapter(sl, con);
sad.Fill(ds, "comploc_count");
int totalemp = (int) ds.Tables
   ["emp_count"].Rows[0]["cnt"];
int comploc = (int) ds.Tables
  ["comploc_count"].Rows[0]["cnt"];
Console.WriteLine(
"There are {0} employee, 
     {1} complocation .",
totalemp ,
 comploc,
);
}
}
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