Hello Vuyiswa Maseko,
Do you have all the needed assemblies added to the references, for example one of the errors says that you don't have Telerik.Windows.Controls.GridView? Do you have it added to your references?
When you see an error that Visual Studio cannot find something, you have to add the respective assembly (dll) to your project assembly references and make sure that the prefix that you use before them (i.e. telerik) has the correct entry on the top of the page.
When all of these are met -- your project will compile.
I have attached a sample project which you can examine and see how the things are done. I hope this helps.
In case you are completely lost and cannot make your project compile by any means, please send it to us and we will take a look at it.
the Telerik team
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