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AnswerRe: Deleting items in group with a Condition [C#] Pin
OriginalGriff13-Mar-19 20:58
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AnswerRe: Deleting items in group with a Condition [C#] Pin
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QuestionSending Json looking formatted plain text to be de-serialized. Pin
holdorf13-Mar-19 11:16
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OriginalGriff13-Mar-19 20:57
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QuestionHow will i make the back color red for each rows in the listview? Pin
Fxty13-Mar-19 2:24
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AnswerRe: How will i make the back color red for each rows in the listview? PinPopular
OriginalGriff13-Mar-19 2:41
protectorOriginalGriff13-Mar-19 2:41 
Firstly, don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:
SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'
The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:
SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'
Which SQL sees as three separate commands:
SELECT * FROM MyTable WHERE StreetAddress = 'x';
A perfectly valid SELECT
DROP TABLE MyTable;
A perfectly valid "delete the table" command
--'
And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?

Secondly, if I do much what you have there, it works fine:
listView1.Items.Clear();
listView1.Items.Add("aaa");
listView1.Items.Add("bbb");
listView1.Items.Add("acc");
listView1.Items.Add("ddd");
int itemCount = 0;
foreach (ListViewItem item in listView1.Items)
    {
    if ((itemCount++ & 1) == 0) item.BackColor = Color.Red;
    }
So start by checking with the debugger exactly what is happening - at a guess, you have no items loaded into your ListView but without being able to run your code through the debugger and with your data available, we can't tell.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!

QuestionHow to get the Focal Length of a Canon Camera Pin
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Questionmultiple dropdown list in excel file Pin
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QuestionCatch JavaScript errors Pin
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