无法更新SQL Server中的varbinary（max）列

我正尝试使用varbinary（SQL Server 2008）更新我的个人资料图片。它似乎没有更新我把文件上传的图片。然后我尝试将我的个人资料图片列设置为NULL，但它似乎也没有工作。以下是我用于将我的个人资料图片列更新为NULL并使用fileupload更新个人资料图片并将其转换为varbinary（MAX）的代码。请帮我看看我做错了什么。谢谢！无法更新SQL Server中的varbinary（max）列

protected void btnUpload_Click(object sender, EventArgs e) 
    { 
     String username = (String)Session["username"]; 

     string filePath = FileUpload1.PostedFile.FileName; 
     string filename = Path.GetFileName(filePath); 
     string ext = Path.GetExtension(filename); 

     string contenttype = String.Empty; 

     switch (ext) 
     { 
      case ".jpg": 
       contenttype = "image/jpg"; 
       break; 
     } 
     if (contenttype != String.Empty) 
     { 
      Stream fs = FileUpload1.PostedFile.InputStream; 

      BinaryReader br = new BinaryReader(fs); 

      Byte[] bytes = br.ReadBytes((Int32)fs.Length); 

      string strQuery = "Update LoginRegisterOthers Set profilepic = NULL Where username = '" + username + "'"; 
      SqlCommand cmd = new SqlCommand(strQuery); 
      InsertUpdateData(cmd); 

      //insert the file into database 
      //string strQuery2 = "Update LoginRegisterOthers Set profilepic = @Data Where username = @Username"; 
      //SqlCommand cmd2 = new SqlCommand(strQuery2); 
      //cmd2.Parameters.Add("@Data", SqlDbType.Binary).Value = bytes; 
      //cmd2.Parameters.Add("@Username", SqlDbType.VarChar).Value = username; 
      //InsertUpdateData(cmd2); 
      //lblUpload.ForeColor = System.Drawing.Color.Green; 
      //lblUpload.Text = "Profile Updated."; 

      Response.Redirect("MemberProfile.aspx"); 
     } 
     else if (contenttype == String.Empty) 
     { 
      lblUpload.Text = "Please select your image before uploading!"; 
     } 
     else 
     { 
      lblUpload.ForeColor = System.Drawing.Color.Red; 
      lblUpload.Text = "File format not recognised." + " Upload Image formats"; 
     } 
    } 

    private Boolean InsertUpdateData(SqlCommand cmd) 
    { 
     SqlConnection con = new SqlConnection("Data Source=localhost; Initial Catalog=project; Integrated Security=True"); 
     cmd.CommandType = CommandType.Text; 
     cmd.Connection = con; 
     try 
     { 
      con.Open(); 
      cmd.ExecuteNonQuery(); 
      return true; 
     } 
     catch (Exception ex) 
     { 
      Response.Write(ex.Message); 
      return false; 
     } 
     finally 
     { 
      con.Close(); 
      con.Dispose(); 
     } 
    }

来源

2013-06-04 XiAnG

无法更新SQL Server中的varbinary（max）列

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