Convert int to string and read it in c# windows application

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Hi guys, i am new in c# and want to ask:

i already had a database that filled up with numbers, and want to show it on my form as string. How do i call the value of that numbers from int to string? When user type "0" which is start of the number, it will display to the screen the numbers that start from "0" based on my database

Here is my code so far:

C#

string connectionString = (@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\Archives\Projects\Program\Sell System\Sell System\App_Data\db1.accdb;Persist Security Info=False;");

OleDbDataReader dReader;
            OleDbConnection conn = new OleDbConnection(connectionString);
            conn.Open();
            OleDbCommand cmd = new OleDbCommand("SELECT DISTINCT [Code] FROM [Data] ORDER BY [Code] ASC", conn);
            dReader = cmd.ExecuteReader();
            AutoCompleteStringCollection codesCollection = new AutoCompleteStringCollection();

            while (dReader.Read())
            {
                // I must fill this with what?
            }

            dReader.Close();
            conn.Close();

Thank you

Posted 5-Aug-13 21:00pm

Member 10191939

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Jignesh Khant 6-Aug-13 3:04am

string v1 = dReader[3].ToString();

here your dReader[3] is that int value comming from db.

Member 10191939 6-Aug-13 3:24am

i already did like this, but it is only works when i show to message box, not to autostringcompletion:

string numString = dReader[0].ToString();
MessageBox.Show(numString);

it has successfully work, but when i change the "MessageBox.Show" to "codesCollection.Add(dReader.GetString(0)), the windows forms completely blank, but the program runs

Jameel VM 6-Aug-13 3:12am

what format you filled up the numbers?

Member 10191939 6-Aug-13 3:20am

my numbers is 1 to 10, but before the number, i put the format 0000, so it will become 0001, 0002 and so on

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Jameel VM · Answer 1 · 2013-08-05T21:27:00

Solution 1

Hope this are what you expect

C#

string number="";
while (dReader.Read())
{
   number ="000"+ dReader["Code"].ToString();
}

Hope this helps

Posted 5-Aug-13 21:27pm

Jameel VM

Updated 6-Aug-13 1:07am

v3

adriancs · Answer 2 · 2013-08-06T00:30:00

This code:

C#

string numString = "000" + dReader["Code"].ToString();

If the value is 2, you will get 0002.
But if the value is 200, you will get 000200, which I think is not what you want.
If the value is 200, the outcome should be 0200.
You can use PadLeft() to solve this:

C#

while (dReader.Read())
{
    string number = dReader["Code"].ToString().PadLeft(4, '0'));
}

Member 10191939 · Answer 3 · 2013-08-05T21:33:00

Solution 2

Thanks guys, i already solved this myself

This is the code:

<pre lang="c#">string numString = "000" + dReader["Code"].ToString();
                codesCollection.Add(numString);

Posted 5-Aug-13 21:33pm