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using System;
using System.Data;
using System.Data.SqlClient;
 
public class Test
{
	public static void Main()
	{
		Processor processor = new Processor();
		processor.Process();
	}
}
 
public class Processor
{
	IDbTools<IDbCommand> DbTools { get; set; }
 
	public Processor()
	{
	}
 
	public void Process()
	{
		DbTools = (IDbTools<IDbCommand>) new Tools();
		DbTools.PrepareAndExecuteQuery(new SqlCommand());
	}
}
 
public class Tools : IDbTools<SqlCommand>
{
	public void PrepareAndExecuteQuery(SqlCommand command)
	{ }
}
 
public interface IDbTools<in TCommand>
	where TCommand : IDbCommand
{
	void PrepareAndExecuteQuery(TCommand command);
}

prog.cs(2,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing `System.Data' assembly reference?
prog.cs(3,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing `System.Data' assembly reference?
prog.cs(29,31): error CS0246: The type or namespace name `SqlCommand' could not be found. Are you missing an assembly reference?
prog.cs(36,19): error CS0246: The type or namespace name `IDbCommand' could not be found. Are you missing an assembly reference?
prog.cs(16,11): error CS0246: The type or namespace name `IDbCommand' could not be found. Are you missing an assembly reference?
prog.cs(31,37): error CS0246: The type or namespace name `SqlCommand' could not be found. Are you missing an assembly reference?
Compilation failed: 6 error(s), 0 warnings

Standard output is empty