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How to detect double-keyboard with ReactiveUI [closed]

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how to detect double-key board (like double key-Enter) With ReactiveUI

How about this:
doubleEnter = someWindow.Events().KeyUp
.Where(x => x.EventArgs.Key == Key.Enter)
.Buffer(TimeSpan.FromMilliseconds(650), RxApp.MainThreadScheduler)
.Where(x => x.Length > 1);

Retrieve List<Object> to List<String> [closed]

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Currently, I have a List<object> like this: List<USER>.
In User class, I have column named UserName.
I want to retrieve this column to List<string>.
How can it work without using foreach for List<USER>?
Thanks.

You can use LINQ:
List<string> userNames = users.Select(u => u.UserName).ToList();

In addition to Tim Schmelter post:
For casting IEnumerable<object> to IEnumerable<USER> you may use Cast<T> or OfType<T> method.
This can be written as follows:
var userNames = users.Cast<USER>.Select(u => u.UserName).ToList();

How can I convert DIA_User[] to List<DIA_User> [closed]

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I used wcf service to work directly to database.
And the result I got as this format: DIA_User[]
I can use linq for this as select, find,... but I dont know how to convert to List<DIA_User>
Please advise.
Thank you very much.

Just use ToList() method, which is an extension method on IEnumerable<>
DIA_User[] x = new DIA_User[] {};
List<DIA_User> y = x.ToList();

List<DIA_USER> users = new List<DIA_USER>(diaUserArray);

var arrayUser = new DIA_User[]();
var listUsers = arrayUser.ToList();
BTW, you can configure your WCF service to send Lists instead of Arrays.

Need to convert SQL to Linq-To-SQL [closed]

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select cast(' ' as varchar(1000)) as myfield, otherfield
from tab1;
I need to convert above SQL to Linq-To-Sql.

Maybe:
from item in dataContext.Items
select new { MyField = "", Item = item };
Unfortunately, AMAIK, there is no way to declare * in projection in LINQ. Thus to have all other fields alongside your MyField field, you should write them all.

Update DataTable records by Id in C# [closed]

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Could anyone please suggest, I have a datatable with 100 records and want to update any 1 specific record based on id.

Here is an example, maybe it helps even if your reqirement is not that clear:
DataRow row = tableWith100Rows.AsEnumerable()
.FirstOrDefault(r => r.Field<int>("ID") == 4711);
if(row != null)
row.SetField("ColumnToUpdate", "new value");