C#使用FileStream和StreamWriter写入文件时出现文件被其他程序...

出现异常的代码：

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if (System.IO.File.Exists(ProjectInPath + "/Project/ProjectName/ProjectNameRead.LMPN"))
 {
 String ProjectNameWrite = System.IO.File.ReadAllText (ProjectInPath + "/Project/ProjectName/ProjectNameRead.LMPN");
 FileStream fs_sw = new FileStream(ProjectInPath + "/Project/ProjectName/ProjectNameRead.LMPN", FileMode.Create );
 StreamWriter sw_fs = new StreamWriter(fs_sw);
 if(ProjectNameWrite == "")
 {
 sw_fs.Write(ProjectName);
 }
 else
 {
 sw_fs.Write(ProjectNameWrite + Environment.NewLine + ProjectName); 
 }
 sw_fs.Flush();
 sw_fs.Close();
 fs_sw.Close();
 FileStream FS = new FileStream(ProjectInPath + "/Project/ProjectPath/" + ProjectName + ".LMPP",FileMode.Create);
 StreamWriter SW = new StreamWriter(FS);
 SW.Write("DefaultProjectPath");
 SW.Flush();
 SW.Close();
 FS.Close();
 FileStream FSSW = new FileStream(ProjectInPath + "/Project/ProjectDate/" + ProjectName + ".LMPD",FileMode.Create);
 StreamWriter SWFS = new StreamWriter(FSSW);
 SWFS.Write(CreateDate);
 SWFS.Flush();
 SWFS.Close();
 FSSW.Close();
 FileStream fs_LastOpenTime = new FileStream(ProjectInPath + "/Project/LastOpenTime/" + ProjectName + ".LMLOT", FileMode.Create);
 StreamWriter sw_LastOpenTime = new StreamWriter(fs_LastOpenTime);
 sw_LastOpenTime.Write(System.DateTime.Now.ToString());
 sw_LastOpenTime.Flush();
 sw_LastOpenTime.Close();
 fs_LastOpenTime.Close();
 FileStream fs_FinallyOpenProject = new FileStream(ProjectInPath + "/Project/FinallyOpenProject/FinallyOpenProject.LMFOP", FileMode.Create);
 StreamWriter sw_FinallyOpenProject = new StreamWriter(fs_FinallyOpenProject);
 sw_FinallyOpenProject.Write(ProjectName);
 sw_FinallyOpenProject.Flush();
 sw_FinallyOpenProject.Close();
 fs_FinallyOpenProject.Close();
 return true;
 }
 else
 {
 return false;
 }

还使用了一段代码，调试了数次之后，发现似乎与这段代码有些关系：

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String line = String.Empty;
                        int IfProjectNameSave = 0;
                        using (StreamReader reader = new StreamReader(SC.GetInPath() + "/Project/ProjectName/ProjectNameRead.LMPN"))
                        {
                            line = reader.ReadLine();
                            while(line != null && line != "")
                            {
                                if(TextBox_项目名称.Text == line)
                                {
                                    MessageBox.Show("已存在相同项目名的项目！", "提示");
                                    IfProjectNameSave = 1;
                                    break;
                                }else
                                {
                                    IfProjectNameSave = 2;
                                }
                                line = reader.ReadLine();
                            }
                            if(System.IO.File.ReadAllText(SC.GetInPath() + "/Project/ProjectName/ProjectNameRead.LMPN") == "")
                            {
                                IfProjectNameSave = 2;
                            }
                            if(IfProjectNameSave == 2)
                            {
                                String ProjectType = String.Empty;
                                String CompileType = String.Empty;
                                Boolean IfCreateProject;
                                if(RadioButton_Windos.Checked)
                                {
                                    ProjectType = "Windows";
                                }
                                if(RadioButton_解释编写.Checked)
                                {
                                    CompileType = "脚本编译";
                                }
                                if(System.IO.File.Exists(SC.GetInPath() + "/Project/DefaultProjectPath/" + TextBox_项目名称.Text + ".LMP"))
                                {
                                    MessageBox.Show("存储路径下有着相同的项目文件，程序将默认为覆盖此项目文件！", "警告");
                                    File.Delete(SC.GetInPath() + "/Project/DefaultProjectPath/" + TextBox_项目名称.Text + ".LMP");
                                    IfCreateProject = SC.CreateProject(TextBox_项目名称.Text, ProjectType, System.DateTime.Now.ToString(), CompileType, SC.GetInPath());
                                    if (IfCreateProject)
                                    {
                                        SC.InEdit();
                                    }
                                    else
                                    {
                                        MessageBox.Show("项目创建失败，请到官网查看解决方法！", "提示");
                                    }

                                }
                                else
                                {
                                    IfCreateProject = SC.CreateProject(TextBox_项目名称.Text, ProjectType, System.DateTime.Now.ToString(), CompileType, SC.GetInPath());
                                    if (IfCreateProject)
                                    {
                                        SC.InEdit();
                                    }
                                    else
                                    {
                                        MessageBox.Show("项目创建失败，请到官网查看解决方法！", "提示");
                                    }
                                }
                            }
                            reader.Close();
                        }