SqlDataAdapter Connection open & close

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C#

using (SqlConnection c = new SqlConnection("Data Source=localhost;Initial Catalog=studinfo;Integrated Security=True"))
       {
          
           // Create new DataAdapter
           using (SqlDataAdapter a = new SqlDataAdapter(
               "SELECT * FROM Stud_Info", c))
           {
              
               DataTable t = new DataTable();
               a.Fill(t);

              
               GridView1.DataSource = t; // <-- From your designer
               GridView1.DataBind(); }}

the above code work very well also it bind data to gridview

Question : who will manage opening & closing the connection here

Posted 15-Feb-14 22:13pm

patil.nitin8358

Updated 15-Feb-14 22:19pm

v2

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 16-Feb-14 5:29am

It automatically does. Please check my answer. :)

2 solutions

Solution 1

SqlConnection object itself takes care of it. You don't have to explicitly mange this connection every time, i.e Once you provide the Connenction String of your database to the code, connection job is done here.
Now you have to take care of your data by query or procedure and stuff and how you display to the user, i.e In Grid or in listview etc.
And if you might have noticed, you can't inherit this SqlConncetion class.
See the documentation[^]
So as you can see, it takes care itself. :)

-KR

Posted 15-Feb-14 22:21pm

Krunal Rohit

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2014-02-15T23:28:00

Refer - DbDataAdapter.Fill Method (DataTable)[^].

Quote:
The Fill method retrieves rows from the data source using the SELECT statement specified by an associated SelectCommand property. The connection object associated with the SELECT statement must be valid, but it does not need to be open. If the connection is closed before Fill is called, it is opened to retrieve data, then closed. If the connection is open before Fill is called, it remains open.