Question

: "DBHelper"的类型初始值设定项引发异常.

using (SqlConnection conn = new SqlConnection(DBHelper.connString))
{
string sql = string.Format("update [HY] set 密码='{0}' where 用户名='{1}'", textBox2.Text.Trim(), UserHelper.userName);
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
int n = Convert.ToInt32(cmd.ExecuteNonQuery());
if (n != 1)
{
MessageBox.Show("密码修改失败！");
}
else
{
MessageBox.Show("密码修改成功！");
UserHelper.password = textBox2.Text.Trim();
}

}

class DBHelper
{
public static string connString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
}
求解决 急

Answer 1

添加配置文件，并在配置文件加上如下配置节：
<connectionStrings>
<add name="ConnectionString" connectionString="连接字符串放在这里"/>
</connectionStrings>

追问

我是新手，请问链接字符串怎么书写啊！谢谢