how to get the location based on textbox data in the Map in windows phone 8.1 using c#4.5,XAML

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XAML

C#4.0

how to get the location based on textbox data from the Map in windows phone 8.1 using c#4.5,XAML.
for example if you enter the location name in to the textbox, then that specific location is displayed on the map.I am new to windows phone development, how can i write the code for my scenario.I tried this scenario, i didn't get clearly about what is Longitude,Latitude, Geolocation etc.I hope anyone help me.

Thanks in advance.