问已尝试读取或写入受保护的内存。这通常表示其他内存已损坏-在某些PC中

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       SqlConnection sqlConnection1 = new sqlConnection("Server=192.168.100.18;Database=test;User Id=sa;Password=111;");

        SqlCommand cmd = new SqlCommand();
        SqlDataReader reader;

        cmd.CommandText = "SELECT * FROM test";
        cmd.CommandType = CommandType.Text;
        cmd.Connection = sqlConnection1;

        sqlConnection1.Open();

        reader = cmd.ExecuteReader();

        sqlConnection1.Close();

        MessageBox.Show("Ok");

Attempted to read or write protected memory. This is often an indication that other memory is corrupt