What is sqldataadapter in dot Net?

Answer 1

Sql Data adapter is a class of System.Sql.SqlClient  Represents a set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database. This class cannot be inherited.

Answer 2

SqlDataAdaptor in an object which acts like a bridge between Database(Sql database) and Dataset object.

private static DataSet SelectRows(DataSet dataset,
    string connectionString,string queryString)
{
    using (SqlConnection connection =
        new SqlConnection(connectionString))
    {
        SqlDataAdapter adapter = new SqlDataAdapter();
        adapter.SelectCommand = new SqlCommand(
            queryString, connection);
        adapter.Fill(dataset);
        return dataset;
    }
}

Answer 3

private static DataSet SelectRows(DataSet dataset,
    string connectionString,string queryString)
{
    using (SqlConnection connection =
        new SqlConnection(connectionString))
    {
        SqlDataAdapter adapter = new SqlDataAdapter();
        adapter.SelectCommand = new SqlCommand(
            queryString, connection);
        adapter.Fill(dataset);
        return dataset;
    }
}