C＃命令截断T-SQL或SQL中的所有表

Question

我正在尝试在C＃

中执行此查询

EXEC sp_MSforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
EXEC sp_MSforeachtable 'DELETE FROM ?'
EXEC sp_MSforeachtable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all

当我在SQL Server Management Studio中运行它时，它可以工作。但是在C＃代码中，查询无效。

private void button2_Click(object sender, EventArgs e)
{
    SqlConnection truncateconnection = new SqlConnection(connection);
    truncateconnection.Open();

    string sql3 = @"EXEC sp_MSforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
                    EXEC sp_MSforeachtable 'DELETE FROM ?'
                    EXEC sp_MSforeachtable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all'";
    SqlCommand cmd_truncate = new SqlCommand(sql3, truncateconnection);

    cmd_truncate.ExecuteNonQuery();

    MessageBox.Show("Working");

    truncateconnection.Close();
}

谢谢。