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How can I generate random alphanumeric strings?
...0123456789";
return new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
}
(Note: The use of the Random class makes this unsuitable for anything security related, such as creating passwords or tokens. Use the RNGCryptoServiceProvider class if ...
How to create Android Facebook Key Hash?
...of your app on facebook. To get there, go to developers.facebook.com/apps, select your app, go to Edit settings and scroll down. After that, wait a few minutes until the changes take effect.
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Change Bootstrap input focus blue glow
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you forgot select
– David Morrow
Sep 4 '14 at 16:03
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Delete text in between HTML tags in vim?
... Also vat (or vit), followed by repeated at (or it) to progressively select surrounding tags . (Or v2at, etc). Then d to delete (etc).
– Joe Freeman
Feb 16 '17 at 17:09
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Increment a database field by 1
...complex depending on your specific needs:
INSERT into mytable (logins)
SELECT max(logins) + 1
FROM mytable
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Error deploying ClickOnce application - Reference in the manifest does not match the identity of the
...curity Settings" Ticked with the Option "This is a full trust application" Selected. This has to do with creating the Manifest correctly and the application will not install if these options are not set on all the Projects within the Solution that require it.
I believe this is the proper way to fi...
How can I auto-elevate my batch file, so that it requests from UAC administrator rights if required?
...ILE 1>NUL 2>NUL & IF ERRORLEVEL 1 (ECHO You must right-click and select &
ECHO "RUN AS ADMINISTRATOR" to run this batch. Exiting... & ECHO. &
PAUSE & EXIT /D)
REM ... proceed here with admin rights ...
This way, the user has to right-click and select "Run as administ...
Interactive search/replace regex in Vim?
...info on the options available once substitution with confirmation has been selected. Use:
:h :s
Then scroll to section on confirm options. Screenshot below:
For instance, to substitute this and all remaining matches, use a.
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Why would you use Expression rather than Func?
...y. Ie. you need database.data.Where(i => i.Id > 0) to be executed as SELECT FROM [data] WHERE [id] > 0. If you just pass in a Func, you've put blinders on your driver and all it can do is SELECT * and then once it's loaded all of that data into memory, iterate through each and filter out ev...
How to join (merge) data frames (inner, outer, left, right)
...s these operations in SQL.
library(sqldf)
## inner join
df3 <- sqldf("SELECT CustomerId, Product, State
FROM df1
JOIN df2 USING(CustomerID)")
## left join (substitute 'right' for right join)
df4 <- sqldf("SELECT CustomerId, Product, State
FROM df1...