then is selectionChange event i Select another data in list and before set it to listbox datasource .. datasource of datagrid change and all columns and data of customer cleared and replaced by Notices ???????
Items appear selected only when the ListView control has focus. To select items in response to a user action such as a button click, be sure to call the Focus method in addition to setting this property.
Then I suspect that the data is not a jpeg file - what are you trying to do? Not "read a file as an Image, but what is the file? Why are you reading it? What are you trying to achieve? It may be that one of use is using the wrong terms!
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What technology are you using? Windows Forms or WPF? If you're using WinForms, there's an implicit WndProc that you can add your code into. If it's WPF, things get a little more complicated as you have to add your own WndProc handler.
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I have used SqlConnection to connection to Sql database. There are some friends, they always use IDbConnection. He also suggest me use IDbConnection. I also see some of project here using IDbConnection: AccountPlus[^]
_ What's the difference bettwen SqlConnection and IDbConnection.
_ Using IDbConnection is better?
SqlConnection implements IDbConnection and therefore IS_A IDbConnection.
In my opinion, one should code to the interfaces; that's what I do, and I'm not the only one. It may not matter now, but if you ever have to provide support for another database, you'll be glad you did.
I regularly work with SQL Server, MySQL, Oracle, Access, and Excel. In the past I've also had to work with Cache, Ingres, and maybe some others I've forgotten. As long as there's an ADO.net connector, my code can work with it.
To add to PIEBALDconsult's answer IDbConnection is not used in LINQ to SQL DataContext or Entity Framework.
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Totally new to LINQ and wondering how I can get the following sandbox code to work. Ideas?
List<PositionValues> list = new List<PositionValues>();
PositionValues item1 = new PositionValues();
item1.Position = 2;
item1.Value = 44;
PositionValues item2 = new PositionValues();
item2.Position = 1;
item2.Value = 33;
var resultList = from b in list group b by b.Position into g orderby b.Value select b;
It relies on:
public struct PositionValues
/// The position.
/// </summary>public int Position;
/// The position.
/// </summary>publicdouble Value;