update db - C# / C Sharp

Hrvoje Voda

I'm adding a field with no value into table. In table I'm allowing null
value.
Then, I'm doing an update and I put a value into that field, but I get an
error:

System.Data Concurency Violation : the Update Command affected 0 records.

Why?

Then, when I close a program and call it again and I try to put a value into
that empty field I don't get an error.

Where is a problem?

Hrcko

Nov 17 '05 #1

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1113

Nicholas Paldino [.NET/C# MVP]

Hrvoje,

Can you show the code you are using? A concurrency violation indicates
that there has been a change in the table's values from the time that you
selected the values from the table.

Do you have a timestamp on the table? If you don't, the data adapter
will check for concurrency by checking the value of each individual field,
which can be problematic.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Hrvoje Voda" <hr*********@luatech.com> wrote in message
news:da**********@ss405.t-com.hr...

I'm adding a field with no value into table. In table I'm allowing null
value.
Then, I'm doing an update and I put a value into that field, but I get an
error:

System.Data Concurency Violation : the Update Command affected 0 records.

Why?

Then, when I close a program and call it again and I try to put a value
into that empty field I don't get an error.

Where is a problem?

Hrcko

Nov 17 '05 #2

Hrvoje Voda

What is timestamp?
Should I put on the table?
How?

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:eB*************@TK2MSFTNGP15.phx.gbl...

Hrvoje,

Can you show the code you are using? A concurrency violation indicates
that there has been a change in the table's values from the time that you
selected the values from the table.

Do you have a timestamp on the table? If you don't, the data adapter
will check for concurrency by checking the value of each individual field,
which can be problematic.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Hrvoje Voda" <hr*********@luatech.com> wrote in message
news:da**********@ss405.t-com.hr...
I'm adding a field with no value into table. In table I'm allowing null
value.
Then, I'm doing an update and I put a value into that field, but I get an
error:

System.Data Concurency Violation : the Update Command affected 0 records.

Why?

Then, when I close a program and call it again and I try to put a value
into that empty field I don't get an error.

Where is a problem?

Hrcko

Nov 17 '05 #3

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