c#图片问题

Question

我想在VS2008中，将需要的图片根据数据库中一个 风速 的实时表显示的数据显示出来，例如，风速<=15时候，自动显示A图片；风速<=20时候，自动显示B图片;风速<=25时候，自动显示C图片；等等 
我写了如下代码，但是代码运行到如下地方的时候就跳过不运行了，没报错和警告，请高手看看，有什么问题。
              
（1）跳过不运行的代码：
 if (Wind <= 15)
                     ｛
                                          this.A_W1.Image = Image.FromFile("绿18x18.gif");                      }
                      else if (Wind <= 20)
                      {
                          this.A_W1.Image = WindowsFormsApplication1.Properties.Resources.灰18x18;                      }                      else if (Wind <= 25)
                      {
                          this.A_W1.Load("灰18x18.gif");                      }                      else if (Wind <= 30)
                      {
                          this.A_W1.Image = Image.FromFile("WindowsFormsApplication1.Properties.Resources\\绿18x18.gif");
                      }                      else if (Wind <= 12000)
                      {
                          this.A_W1.Image = Image.FromFile("WindowsFormsApplication1.Properties.Resources\\绿18x18.gif")；                                              } （2）总代码： private void Form1_Paint(object sender, EventArgs e)
        {            if (A_W1.Image != null)
            {// 清除Picturebox的图片
                A_W1.Image.Dispose();
                A_W1.Image = null;
            }           
           
            
            
            
            //设置连接字符串
            string connectionString ="data source=localhost;user id=sa;pwd=12345678;database=RailWay;";           //检索WS_Real表的SQL语句
           string cmdText= "select Wind_Speed from WS_Real";
           
         //创建SqlConnection类的实例，用于连接SQL Server 数据库             SqlConnection con = new SqlConnection(connectionString);
            
               try
               {
                    //打开连接                     con.Open();                    //创建数据适配器
                     SqlDataAdapter da=new SqlDataAdapter(cmdText,con);
                    //创建DataSet,此时得到的是空数据集
                   DataSet ds=new DataSet();                //      填充数据集
                      da.Fill(ds,"WS_Real");
                      DataTable dt = ds.Tables["WS_Real"];                      string str = dt.Rows[0][0].ToString();                      int Wind = Convert.ToInt32(str);                   if (Wind <= 15)
                     ｛
                                          this.A_W1.Image = Image.FromFile("绿18x18.gif");                      }
                      else if (Wind <= 20)
                      {
                          this.A_W1.Image = WindowsFormsApplication1.Properties.Resources.灰18x18;                      }                      else if (Wind <= 25)
                      {
                          this.A_W1.Load("灰18x18.gif");                      }                      else if (Wind <= 30)
                      {
                          this.A_W1.Image = Image.FromFile("WindowsFormsApplication1.Properties.Resources\\绿18x18.gif");
                      }                      else if (Wind <= 12000)
                      {
                          this.A_W1.Image = Image.FromFile("WindowsFormsApplication1.Properties.Resources\\绿18x18.gif")；                                              }
                     
               }               catch (Exception s)
                {
                    Console.WriteLine(s.Message);
                }
                finally                { con.Close(); }
            }

Answer 1

int Wind = Convert.ToInt32(str);此处设个断点看看Wind 是什么

Answer 2

  this.A_W1.Image = Image.FromFile("WindowsFormsApplication1.Properties.Resources\\绿18x18.gif");
这样读取文件的方式对不对

Answer 3

调试下  看执行到那了。进没进catch

Answer 4

在SQL数据库中，为什么我更改完数据后，每次只有重新打开数据库，才可以SELECT 到新数据。应该怎么做，有人知道吗，谢谢