DataReader
DataReader is used to read the data
from database and it is a read and forward only connection oriented
architecture during fetch the data from database. DataReader is used
to iterate through resultset that came from server and it will read one record at a time because of that memory
consumption will be less and it will fetch the data very fast when compared
with dataset. Generally we will use ExecuteReader object to bind data to datareader. (Read More)
Sample
code of datareader will be like this
C# Code
// This method is used to bind gridview from
database
protected void BindGridview()
{
using (SqlConnection con = new
SqlConnection("Data
Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB"))
{
con.Open();
SqlCommand cmd = new SqlCommand("Select UserName,LastName,Location FROM
UserInformation", con);
SqlDataReader dr =
cmd.ExecuteReader();
gvUserInfo.DataSource = dr;
gvUserInfo.DataBind();
con.Close();
}
}
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VB.NET Code
' This method is used to bind gridview from database
Protected Sub BindGridview()
Using con
As New SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial
Catalog=MySampleDB")
con.Open()
Dim cmd
As New SqlCommand("Select
UserName,LastName,Location FROM UserInformation", con)
Dim dr As SqlDataReader
= cmd.ExecuteReader()
gvUserInfo.DataSource
= dr
gvUserInfo.DataBind()
con.Close()
End Using
End Sub
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DataSet
DataSet
is a disconnected orient architecture that means there is no need of active
connections during work with datasets and it is a collection of DataTables and
relations between tables. It is used to hold multiple tables with data. You can
select data form tables, create views based on table and ask child rows over
relations. Also DataSet provides you with rich features like saving data as XML
and loading XML data.
C# Code
// This method is used to bind gridview from database
protected
void BindGridview()
{
SqlConnection con = new SqlConnection("Data
Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB");
con.Open();
SqlCommand cmd = new SqlCommand("select
UserName,LastName,Location from UserInformation", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet
ds = new DataSet();
da.Fill(ds);
gvUserInfo.DataSource
= ds;
gvUserInfo.DataBind();
}
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VB.NET Code
' This method is used to bind gridview from database
Protected
Sub BindGridview()
Dim
con As New
SqlConnection("Data
Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB")
con.Open()
Dim
cmd As New
SqlCommand("select
UserName,LastName,Location from UserInformation", con)
Dim
da As New
SqlDataAdapter(cmd)
Dim
ds As New
DataSet()
da.Fill(ds)
gvUserInfo.DataSource
= ds
gvUserInfo.DataBind()
End
Sub
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DataAdapter
DataAdapter
will acts as a Bridge between DataSet and database. This dataadapter object is
used to read the data from database and bind that data to dataset. Dataadapter
is a disconnected oriented architecture. Check below sample code to see how to
use DataAdapter in code
C# Code
// This method is used to bind gridview from database
protected
void BindGridview()
{
SqlConnection con = new SqlConnection("Data
Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB");
con.Open();
SqlCommand cmd = new SqlCommand("select
UserName,LastName,Location from UserInformation", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet
ds = new DataSet();
da.Fill(ds);
gvUserInfo.DataSource
= ds;
gvUserInfo.DataBind();
}
|
VB.NET Code
' This method is used to bind gridview from database
Protected
Sub BindGridview()
Dim
con As New
SqlConnection("Data
Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB")
con.Open()
Dim
cmd As New
SqlCommand("select
UserName,LastName,Location from UserInformation", con)
Dim
da As New
SqlDataAdapter(cmd)
Dim
ds As New
DataSet()
da.Fill(ds)
gvUserInfo.DataSource
= ds
gvUserInfo.DataBind()
End
Sub
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