Problem in SQL query

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hi my friends.
i have this code in c#.
but i have error for query:

C#

SqlCommand cmd1 = new SqlCommand();                
 cmd1.Connection = Class_SQL.con;

                cmd1.CommandText = "delete from Tbl_CustomerTools where IDDevice=(select ID from Tbl_CustomerDevice where Cust_Id=(select Cust_Id from Tbl_CustomerDetail where Cust_Id = '" + IDCust_Selected + "))'";
                
                Class_SQL.con.Open();
                cmd1.ExecuteNonQuery();
                Class_SQL.con.Close();

and i test this query in sql and it was true.
but in c# no.
what should i do??

What I have tried:

SqlCommand cmd1 = new SqlCommand();
cmd1.Connection = Class_SQL.con;

cmd1.CommandText = "delete from Tbl_CustomerTools where IDDevice=(select ID from Tbl_CustomerDevice where Cust_Id=(select Cust_Id from Tbl_CustomerDetail where Cust_Id = '" + IDCust_Selected + "))'";

Class_SQL.con.Open();
cmd1.ExecuteNonQuery();
Class_SQL.con.Close()

Posted 12-Aug-16 3:22am

Mohammad Hasanpoor

Updated 17-Aug-16 0:51am

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3 solutions

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Mohammad Hasanpoor · Answer 1 · 2016-08-12T03:35:00

Solution 1

ook. i solved it. this code is true :

C#

cmd1.CommandText = "delete from Tbl_CustomerTools where IDDevice in (select ID from Tbl_CustomerDevice where Cust_Id in (select Cust_Id from Tbl_CustomerDetail where Cust_Id = " + IDCust_Selected + "))";

Posted 12-Aug-16 3:35am

Mohammad Hasanpoor

Member 12680411 · Answer 2 · 2016-08-17T00:43:00

Solution 2

you should be assigned CommandType:

C#

cmd1.CommandType=CommandType.Text

Posted 17-Aug-16 0:43am

Member 12680411

Patrice T · Answer 3 · 2016-08-17T00:51:00

Solution 3

In

C#

cmd1.CommandText = "delete from Tbl_CustomerTools where IDDevice=(select ID from Tbl_CustomerDevice where Cust_Id=(select Cust_Id from Tbl_CustomerDetail where Cust_Id = '" + IDCust_Selected + "))'";

you should try to replace "))'" with "'))"

Posted 17-Aug-16 0:51am

Patrice T