How can I display a value from an SQL database to a label control in ASP.NET?

Question

0.00/5 (No votes)

See more:

con.Open();

<pre><pre lang="text">
SqlCommand cmd_orderNo = new SqlCommand("SELECT IDENT_CURRENT('Oreders_Table') + IDENT_INCR('Oreders_Table')",con);
SqlDataReader dr = cmd_orderNo.ExecuteReader();
if (dr.Read())
{
Label28.Text = dr["O_number"].ToString();

}

What I have tried:

Is the above code right or not?

if it's wrong then how I can do it?

Posted 27-Feb-22 23:43pm

Ansam Y. B.

Updated 28-Feb-22 1:19am

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)

OriginalGriff · Answer 1 · 2022-02-28T01:19:00

Well ... it's right and wrong.
It'll probably work, but ... it's also probably flawed as well.

A DataReader return rows, yes - but what it is designed for is returning multiple rows - and since you are only interested in a single value, then directly using ExecuteScalar instead is a better idea.

And since you don't name your column in the SELECT statement, it';s unlikely that the DataReader indexing will work.

But the biggy is that what you seem to be doing is trying to "pre-generate" an ID number before you insert a row, and that's dangerous: SQL is a multiuser system so what works fine in development with just you testing then fails and throws up horrible intermittent data corruption problems which are a bugger to fix because two different users pre-generated the same ID and used it later.

Instead, change your DB to use an IDENTITY field as the ID, and only access that in your C# code once you INSERT the new row using the @@IDENTITY[^] variable. SQL will ensure you get unique values only.