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Unable to cast object of type 'System.DBNull' to type 'System.String`
I got the above error in my app. Here is the original code
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How to Concatenate Numbers and Strings to Format Numbers in T-SQL?
I have the following function
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How to kill a child process after a given timeout in Bash?
I have a bash script that launches a child process that crashes (actually, hangs) from time to time and with no apparent reason (closed source, so there isn't much I can do about it). As a result, I would like to be able to launch this process for a given amount of time, and kill it if it did not re...
Saving changes after table edit in SQL Server Management Studio
...at require table re-creation”.
Here is a very good explanation on this:
http://blog.sqlauthority.com/2009/05/18/sql-server-fix-management-studio-error-saving-changes-in-not-permitted-the-changes-you-have-made-require-the-following-tables-to-be-dropped-and-re-created-you-have-either-made-changes-t...
How to initialize const member variable in a class?
When I am trying to initialize the const member variable t with 100. But it's giving me the following error:
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Is it better to call ToList() or ToArray() in LINQ queries?
I often run into the case where I want to eval a query right where I declare it. This is usually because I need to iterate over it multiple times and it is expensive to compute. For example:
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Hidden Features of Java
... of
java -classpath ./lib/log4j.jar:./lib/commons-codec.jar:./lib/commons-httpclient.jar:./lib/commons-collections.jar:./lib/myApp.jar so.Main
See http://java.sun.com/javase/6/docs/technotes/tools/windows/classpath.html
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Apply a function to every row of a matrix or a data frame
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
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Null check in an enhanced for loop
What is the best way to guard against null in a for loop in Java?
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Avoiding instanceof in Java
... }
}
}
More info on usage of variables of type Class in Java: http://docs.oracle.com/javase/tutorial/reflect/class/classNew.html
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