Delete Using Dataset Update Method : Concept Not clear

Question

3.00/5 (2 votes)

See more:

//Delete Record : Disconnected

public void DeleteBook(int BookId)
    {
      1)  DataRow dr1 = ds.Tables["tbl_Books"].NewRow();
      2) dr1 = ds.Tables["tbl_Books"].Rows.Find(BookId);
      3)  dr1.Delete();       
      4)  SqlCommand delcmd = new SqlCommand("Delete from tbl_Books where BookId="  BookId.ToString(), cn);
      5)  SqlCommandBuilder cmdb = new SqlCommandBuilder(da1);
      6)  da.DeleteCommand = delcmd;
      7)  da.Update(ds.Tables ["tbl_Books"]);
    
    }

The Above code is working fine. But the concept is not clear.
After Execution of Statement No.(3) the particular row is romoved from the DataSet.
Then the Update Commad (ie Statement(7)) should update the data to database.

Then what is the use of Statement (4),(5) and (6).
Is there any other way to write above code without "Delete Query"
If so please prove the code....

Posted 17-Mar-11 2:50am

SHAJANCHERIAN

Updated 17-Mar-11 2:51am

JF2015

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

SHAJANCHERIAN · Accepted Answer · 2011-03-17T02:57:00

//I Got the answer .. What i am expecting was as follows..
//=========================================================
public void DeleteBook(int BookId)
{
DataRow dr1 = ds.Tables["tbl_Books"].NewRow();
dr1 = ds.Tables["tbl_Books"].Rows.Find(BookId);
dr1.Delete();
SqlCommandBuilder cmdb = new SqlCommandBuilder(da);
da.Update(ds.Tables ["tbl_Books"]);
}