Good place to get start is Develop your first map app—ArcGIS Runtime SDK for .NET (WPF) | ArcGIS for Developers which walks you through building first app with a map. You can also look into our Browse ArcGIS DevLabs | ArcGIS for Developers which shows more examples. After that you can continue learning more by reading the documentation on the topics that you need to use and look our GitHub - Esri/arcgis-runtime-samples-dotnet: Sample code for ArcGIS Runtime SDK for .NET – UWP, WPF,... to more details how to work with the functionality.
Like Antti mentioned, the DevLabs are a great place to start. These are step by step tutorials and should give you plenty of resources to get started. You do not have to download the code from GitHub. Below is the link to all of the .NET ones. There are 11 of them. If you try them and find them confusing, please let us know which ones you tried and what specifically you found confusing about each individual dev lab.
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Sir , To be very honest , I am a java developer and i have been assigned to work in GIS (Creating WPF application using ArcGIS runtime sdk in .NET) .
I found a book called "LEARNING ARCGIS FOR .NET by Ron VINCENT" , It is a very nice book which describes how to work with ArcGIS by implementing MVVM Pattern using MVVMLIGHT Toolkit , but unfortunately that book supports version 10.2.7 and there is a drastic change in 100.2.1. Sir I am in a lot of trouble , Please help me with a any studying material. Or a small basic application with atleast 2-3 pages , so that i can catch up with the flow.
I recommend you take a look at the Offline Mapbook for WPF | ArcGIS for Developers. It's an example app built in WPF with .NET Runtime 100.2. It comes with detailed documentation and the app is open source, you can use it to get started with your app. We also have the same app for Android, which is written in Java: Offline Mapbook for Android | ArcGIS for Developers . You can use both apps side by side to learn basic concepts as the APIs are very similar in functionality.
Hope this helps,
The app I provide is a fully functional and tested application. Can you provide more information about your environment and what error you are getting.
If you're a Java developer who's new to C# and XAML/WPF, I'd recommend starting with Microsoft's learning material. Once you got those things down, adding the runtime api should come pretty natural.
Also the Runtime API does also come with a Java version, if you'd like to stick to Java.