System.data.sqlclient' is either not registered

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entity-framework

.NET-Core2.1

I am trying to save data into the MS SQL db using Entity Framework in dot net core. 
But I am getting this error - "The ADO.NET provider with invariant name 'System.Data.SqlClient' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details.' 
"

What I have tried:

I googled the error but couldn't find the solution.
The project is in dot net core.

I installed Entity Framework Core in both the entity project as well as my web project.

Also, added the following code in my web project's app.config file:

<pre>configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <connectionStrings>
    <add name="SampleTaskEntities" connectionString="metadata=res://*/SampleTask.csdl|res://*/SampleTask.ssdl|res://*/SampleTask.msl;provider=System.Data.SqlClient;provider connection string="data source=SUYASH3148523;initial catalog=SampleTask;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <entityFramework>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration>