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Request for the permission of type System.Data.SqlClient.SqlClientPermission while debugging

Hi every one,

I have surfed Internet for a long time but I could not find any answer yet !

I wrote a simple plugin to connect to sql server database, It works when I register it (isolation mode is non), but when I debug it in Visual Studio I get below error !

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
Detail: <OrganizationServiceFault xmlns="schemas.microsoft.com/.../Contracts" xmlns:i="www.w3.org/.../XMLSchema-instance">
<ErrorCode>-2147220970</ErrorCode>
<ErrorDetails xmlns:a="schemas.datacontract.org/.../System.Collections.Generic">
    <KeyValuePairOfstringanyType>
      <a:key>CallStack</a:key>
      <a:value i:type="b:string" xmlns:b="www.w3.org/.../XMLSchema">   at MyFirstPlugin.MyFirstPlugin.Execute(IServiceProvider serviceProvider)
   at PluginProfiler.Library.PluginAppDomainProxy.ExecuteCore(Stopwatch watch, ProfilerExecutionReport report, Object instance, Object executionParameter)
   at PluginProfiler.Library.AppDomainProxy.Execute(ProfilerExecutionConfiguration configuration, ProfilerExecutionReport report)</a:value>
    </KeyValuePairOfstringanyType>
</ErrorDetails>
<Message>Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.</Message>
<Timestamp>2018-08-28T06:27:09.0999149Z</Timestamp>
<InnerFault i:nil="true" />
<TraceText i:nil="true" />
</OrganizationServiceFault>