CREATE TABLE [dbo].[tbTest](
	[Id] [UNIQUEIDENTIFIER] NOT NULL,
	[Param1] [UNIQUEIDENTIFIER] NULL,
	[Param2] [UNIQUEIDENTIFIER] NULL,
	[Param3] [UNIQUEIDENTIFIER] NULL,
 CONSTRAINT [PK_tbTest] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]


CREATE PROCEDURE [dbo].[spData_I]
    (
      @Param1 UNIQUEIDENTIFIER ,
      @Param2 UNIQUEIDENTIFIER ,
      @Param3 UNIQUEIDENTIFIER
    )
AS
    BEGIN
        SET NOCOUNT ON;

        INSERT  dbo.tbTest WITH ( TABLOCK )
                ( Id, Param1, Param2, Param3 )
        VALUES  ( NEWID(), @Param1, @Param2, @Param3 );
    END;

using (SqlConnection connection = new SqlConnection("Data Source=(local);Initial Catalog=TestDB;Integrated Security=True"))
 {
     try
     {
         connection.Open();

         System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();

         using (SqlCommand cmd = new SqlCommand("spData_I", connection))
         {
             SqlTransaction transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);
             cmd.Transaction = transaction;

             cmd.CommandType = CommandType.StoredProcedure;
             cmd.Parameters.Add("@Param1", SqlDbType.UniqueIdentifier);
             cmd.Parameters.Add("@Param2", SqlDbType.UniqueIdentifier);
             cmd.Parameters.Add("@Param3", SqlDbType.UniqueIdentifier);

             Guid guid1 = new Guid("11111111-1111-1111-1111-111111111111");
             Guid guid2 = new Guid("22222222-2222-2222-2222-222222222222");
             Guid guid3 = new Guid("33333333-3333-3333-3333-333333333333");

             sw.Start();
             for (int i = 0; i < 10000; i++)
             {
                 cmd.Parameters["@Param1"].Value = guid1;
                 cmd.Parameters["@Param2"].Value = guid2;
                 cmd.Parameters["@Param3"].Value = guid3;

                 cmd.ExecuteNonQuery();
             }

             transaction.Commit();
             sw.Stop();
         }

         MessageBox.Show(sw.Elapsed.TotalSeconds.ToString("N3"));

     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }

exec spData_I @Param1='11111111-1111-1111-1111-111111111111',@Param2='22222222-2222-2222-2222-222222222222',@Param3='33333333-3333-3333-3333-333333333333'
go
exec spData_I @Param1='11111111-1111-1111-1111-111111111111',@Param2='22222222-2222-2222-2222-222222222222',@Param3='33333333-3333-3333-3333-333333333333'
go
...

WITH ( TABLOCK )