Ms Crm Data access

Before I have done the Data access using the linq queries but that take effort, So now I am going for the supported way which has been provided in MS CRM SDK, Using IOraganization with late bound methodology.

Problems while executing the idea

Error 1 'RequestedSecurityToken' is an ambiguous reference between 'Microsoft.IdentityModel.Protocols.WSTrust.RequestedSecurityToken' and 'System.IdentityModel.Protocols.WSTrust.RequestedSecurityToken'

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