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Assign null to a SqlParameter

... for the ?: operator that explains the problem Either the type of first_expression and second_expression must be the same, or an implicit conversion must exist from one type to the other. share | ...
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Display image as grayscale using matplotlib

...If you want to display the inverse grayscale, switch the cmap to cmap='gray_r'. share | improve this answer | follow | ...
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How do you check if a variable is an array in JavaScript? [duplicate]

...re https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray variable instanceof Array This method runs about 1/3 the speed as the first example. Still pretty solid, looks cleaner, if you're all about pretty code and not so much on performance. Note that check...
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POST unchecked HTML checkboxes

... Pollution and has been analyzed by OWASP: owasp.org/images/b/ba/AppsecEU09_CarettoniDiPaola_v0.8.pdf (page 9) where you can find a list of 20 systems systems and see how they handle that. – SimonSimCity Sep 5 '12 at 21:41 ...
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Clearing purchases from iOS in-app purchase sandbox for a test user

...h test accounts. Say that you have a non-consumable with product ID @"Extra_Levels". Instead of writing @"Extra_Levels" in all methods (requestProduct, purchaseProduct, ...), just write PRODUCT_ID1 and at some header file put #define PRODUCT_ID1 @"Extra_Levels" (with no semicolon!), then the preproc...
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How to keep up with the latest versions of Node.js in Ubuntu? PPA? Compiling?

...pet into console: # Using Ubuntu curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash - sudo apt-get install -y nodejs You'll find more info on installing node in different version or different distributions here: https://github.com/nodesource/distributions#installation-instructions Chri...
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Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF

...e like this so that you can specify your own identity values. SET IDENTITY_INSERT Table1 ON INSERT INTO Table1 /*Note the column list is REQUIRED here, not optional*/ (OperationID, OpDescription, FilterID) VALUES (20, 'Hierachy Update', ...
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Test if a variable is set in bash when using “set -o nounset”

...ash $ /bin/bash --version | head -1 GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu) $ set -o nounset If you want a non-interactive script to print an error and exit if a variable is null or not set: $ [[ "${HOME:?}" ]] $ [[ "${IAMUNBOUND:?}" ]] bash: IAMUNBOUND: parameter null or no...
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What is the email subject length limit?

... many problems with the subject you set: 1. Spaces should be encoded with '_', 2. An 'encoded-word' (=?charset?Q/B?data?=) may not be more than 75 characters long (rfc2047). 3rd You can not escape new line with '=' char at the end of the line (header QP encoding is different then body QP). Bottom l...
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Generating a unique machine id

...search I decided the best would be to read MachineGuid in registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography, as @Agnus suggested. It is generated during OS installation and won't change unless you make another fresh OS install. Depending on the OS version it may contain the network ada...