How to use IndexOf Method in C#

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Hello

Below is my C# code............... I need to have a solution to use IndexOf method in the below code:

C#

bool show_classroom_link = false;
       show_classroom_link = (Convert.ToInt32(emp_rs["classroom_program_count"]) > 0) || (emp_rs["security_group_list"].IndexOf(",14,") + 1 > 0);
       emp_rs.Close();
       emp_rs = null;

Error:
show_classroom_link = (Convert.ToInt32(emp_rs["classroom_program_count"]) > 0) || (emp_rs["security_group_list"].IndexOf(",14,") + 1 > 0);
Error Name:
'Object' does not contain a definition for 'IndexOf'

You all are requested to provide a solution for it...

Thanks

Posted 14-Jun-15 22:50pm

Ranju_test

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Thanks7872 15-Jun-15 5:12am

Which part of error is not clear to you? It clearly states that 'Object' don't have such method. Why? Read about indexOf over internet : https://www.google.co.in/search?q=IndexOf&oq=IndexOf&aqs=chrome..69i57j69i59j69i60&sourceid=chrome&es_sm=93&ie=UTF-8#q=indexof+c%23

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sasanka sekhar panda · Answer 1 · 2015-06-14T23:30:00

C#

bool show_classroom_link = false;
//you can use IndexOf on a string
//It returns  zero-based index position of value if that string is found, or -1 if it is not. If value is String.Empty, //the return value is 0.
//Example
           string s = "abcdefg";
            Console.WriteLine(s.IndexOf("fg"));
            //o/p 5
            Console.WriteLine(s.IndexOf("b"));
            //o/p 1
            Console.WriteLine(s.IndexOf("z"));
           //o/p -1


//corrected code
       show_classroom_link = (Convert.ToInt32(emp_rs["classroom_program_count"]) > 0) || (emp_rs["security_group_list"].ToString().IndexOf(",14,") + 1 > 0);
       emp_rs.Close();
       emp_rs = null;