Converters are one of the most significant killers of performance (second perhaps to binding itself) in a XAML application.
To detect when Battery Saver is enabled you must check the
PowerManager.PowerSavingModeEnabled property. Because this property is only available for devices running Windows Phone 8 Update 3, you must access this property via reflection after checking the device OS version. The following example shows you how to detect if Battery Saver is currently enabled.
Sometimes you need to restrict the input to two decimal places in C#. The following function returns true if the input is valid, otherwise it returns false.
You will need to listen to a Key_Down event handler for your
TextBox and put the following code in it. Setting
true prevents the current character to be input in the
This method is ugly but it works. The key part is
IsTabStop property. If I don’t touch it – the keyboard disappers for a fraction of a second and reapears again.
Makes virtual keyboard disappear when user taps enter key.
You just need to call the
LostFocus method and pass the name of the
TextBox control as a parameter to make it lose focus.
Students can get verified and download free softwares through their dreamspark accounts. Here’s how you can get yourself verified.
There are various ways to get verified.
- Using a college/school email id: A email id issued by your school/college with .edu domain
- School account
- Using a International Student Identity card
- Using a verification code: Ask your college’s MSPs to provide you a verification code
If you don’t have any of these then supply a college document. Acceptable documentation is dated student ID, current progress report, current dated class schedule, or acceptance letter to the school of higher education.
Here’s how you could fill it up.
Dictionary<TKey, TValue> provide fast lookups, based on keys, to get values. With them, we use keys and values of any type, including int and string. Dictionary is used with different elements. We specify its key type and its value type (string, int).
Define a Dictionary
We specify its key type and its value type (string, int).
Add elements to a Dictionary
Here’s how to add elements to a
Read and update existing values
To read a value use the following statement.
To update an existing value simply use the following.
Check if a key exists in a Dictionary
This sees if a given string is present in a Dictionary.
Iterate through a Dictionary
Here we loop over
KeyValuePairs in a
Dictionary. With collections like
Dictionary, we must always know the value types. With each
KeyValuePair, there is a
Key member and
Remove elements from a Dictionary
Here’s how you can remove elements from a
Count elements in a Dictionary
This computes the total number of keys in a
Dictionary. This is simpler than accessing the
Keys property, or looping over the
Dictionary to count it.
Clear all elements from a Dictionary
We can erase all pairs with the
Check if a value exists in a Dictionary
This method lacks the constant-time look up speed of ContainsKey. It instead searches the entire collection.
Get all keys of a Dictionary
Here we use the Keys property. We then look through each key and look up the values.