public static SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
if (conn.State ==ConnectionState.Closed)
{
conn.Open();
}
一定要在打开前判断.
public static SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
if (conn.State ==ConnectionState.Closed)
{
conn.Open();
}
一定要在打开前判断.