c# - sqlconnection 中的 ASP.NET 连接错误

Question

你能帮我么

Sqlconnection con;//**error**[The type or namespace name 'Sqlconnection' could not be found (are you missing a using directive or an assembly reference?]

Sqlcommand com;//**error**[The type or namespace name 'Sqlcommand' could not be found (are you missing a using directive or an assembly reference?]

Answer 1

您缺少大写C字母 - C# 区分大小写：

SqlConnection
SqlCommand 
   ^
   |
   |

您还需要确保已在类顶部的块中引用System.Data.DLL并包含命名空间：using

using System.Data.SqlClient;