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Django Forms: if not valid, show form with error message

I Django forms, it can check whether the form is valid: 7 Answers 7 ...
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How find all unused classes in Intellij Idea?

There is an inspection "Unused declaration" which can find all unused code in Intellij Idea. (see this question ) But I want to find all unused classes, not methods, variables etc. Only classes. (it is difficult to find only classes in 3000 result list). How I can do that? ...
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What is the meaning of addToBackStack with null parameter?

I have a customer code. There is only one activity for all of the fragments i.e. the single activity is managing all the fragments. ...
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mailto link multiple body lines

having trouble getting multiple lines to work correctly in a mailto link 4 Answers 4 ...
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How to truncate string using SQL server

i have large string in SQL Server. I want to truncate that string to 10 or 15 character 6 Answers ...
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How do I import the javax.servlet API in my Eclipse project?

I want to develop with Servlets in Eclipse, but it says that the package javax.servlet cannot be resolved. How can I add javax.servlet package to my Eclipse project? ...
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Right to Left support for Twitter Bootstrap 3

There have been questions about this before: Twitter Bootstrap CSS that support from RTL languages 10 Answers ...
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How to set initial value and auto increment in MySQL?

How do I set the initial value for an "id" column in a MySQL table that start from 1001? 10 Answers ...
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PCH File in Xcode 6

In my previous projects, I can find the .pch file under Supporting Files. 6 Answers ...
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Check if list of objects contain an object with a certain attribute value

I want to check if my list of objects contain an object with a certain attribute value. 1 Answer ...