How to retrieve a returned value from a function in C#

Question

1.00/5 (1 vote)

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I got some problems in retrieving a values from a function here's my code.

C#

public int _countContacts(int count)
        {
            string query = @"select count(Contact ID) as count from Contacts";

            dt = _result(query);

            for (int x = 0; x < dt.Rows.Count; x++)
            {
                count = Convert.ToInt16(dt.Rows[x]["count"].ToString());
            }

            return count;
        }

And here my code in other form

C#

private void btnRefresh_Click(object sender, EventArgs e)
        {
            //this is the wrong part
            label1.Text = func._countContacts();
        }

Posted 22-Jul-12 17:33pm

newbie011292

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Vani Kulkarni 22-Jul-12 23:35pm

What is problem you are facing? Are you experiencing any error?

2 solutions

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**JF2015** · Accepted Answer · 2012-07-22T17:49:00

It seems your function definition does not make sense. You should try to use only the return integer, not the parameter as:

C#

public int _countContacts()
{
  int count = 0;
  string query = @"select count(Contact ID) as count from Contacts";

  dt = _result(query);
  
  for (int x = 0; x < dt.Rows.Count; x++)
  {
    count = Convert.ToInt16(dt.Rows[x]["count"].ToString());
  }
 
  return count;
}

One other thing I noticed in your code that may be an error (or it may be correct and I don't truly understand your algorithm): In the line count = Convert.ToInt16... you are overwriting the value of count for every row in your data table. Is this wanted? Better code may be this:

C#

for (int x = 0; x < dt.Rows.Count; x++)
{
  count += Convert.ToInt16(dt.Rows[x]["count"].ToString());
}

Raje_ · Accepted Answer · 2012-07-22T18:02:00

Solution 2

First thing is that you don't need to provide parameter in function, you can declare variable inside function as it has given in solution 1. Second thing is that your function is returning integer value so you need to write following code on button_Click:

C#

int i = func._countContacts();
label1.Text = i.ToString()

Good luck.

Posted 22-Jul-12 18:02pm

Raje_

Updated 22-Jul-12 18:18pm

v2

Comments

newbie011292 23-Jul-12 1:00am

thanks sir.

Raje_ 23-Jul-12 1:19am

you are welcome!