How can I convert an XSD file to C# Class

Use the XML Schema Definition Tool xsd.exe found in your framework tools to convert your schema into a serializable class or dataset.

xsd file.xsd {/classes | /dataset} [/element:element]
         [/language:language] [/namespace:namespace]
         [/outputdir:directory] [URI:uri]

And in example, whereas the C# class will be generated in the same directory as the xsd tool:

xsd /c YourFile.xsd

you can do like this...

  <xsd xmlns='http://microsoft.com/dotnet/tools/xsd/'>
<generateClasses language='CS' namespace='Namespace.subnamespace'>
    <schema>FirstSchema.xsd</schema>
    <schema>AnotherSchema.xsd</schema>
    <schema>LastSchema.xsd</schema>
</generateClasses>
</xsd>