how to get the value from database row wise using ado.net

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I am trying to develop Test engine and i want to get record one by one from Table.

Please help me to solve this problem.

Below code return last record of the table.

OleDbConnection con = new OleDbConnection();
            con.ConnectionString = ConfigurationSettings.AppSettings["connection"];
            con.Open();
            OleDbCommand cmd = new OleDbCommand("Select * from ExamPaper where TestName = @tn", con);
            cmd.Parameters.Add(new OleDbParameter("@tn", cmbtestname.Text));
            OleDbDataReader dr = cmd.ExecuteReader();
            cmbtestname.Items.Clear();

           
                while (dr.Read())
                {
                    txtquestion.Text = Convert.ToString(dr[4]);
                    radioBtn1.Text = Convert.ToString(dr[5]);
                    radioBtn2.Text = Convert.ToString(dr[6]);
                    radioBtn3.Text = Convert.ToString(dr[7]);
                    radioBtn4.Text = Convert.ToString(dr[8]);
                }

Posted 4-Aug-12 6:46am

varuncodee

Updated 4-Aug-12 7:06am

Wes Aday

v2

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[no name] 4-Aug-12 13:05pm

No....you are getting all of the records you are just overwriting txtquestion.text so all you see is the text from the last record.

varuncodee 4-Aug-12 13:08pm

Thanks Wes Aday for reply... so how can i get row one by one in textbox? that is my question.

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Santhosh Kumar Jayaraman · Answer 1 · 2012-08-04T07:05:00

Solution 1

your datareader have all records. but everytime each rows are displayed in textboxes but overwritten by next row.

Use gridView to display all the records. Bind data reader as gridview datasource

Posted 4-Aug-12 7:05am

Santhosh Kumar Jayaraman

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varuncodee 4-Aug-12 13:12pm

Thanks Santhosh .. i don't want to use girdview, I am trying to develop test engine and i want record one by one in text boxes i have next and prev button to navigate through the question's
.. please help..

I.explore.code · Answer 2 · 2012-08-04T14:30:00

this is just off the top of my head. Try populating a

C#

List<>

from the datareader and the use LINQ extensions Skip() and Take() to move one item at a time on next prev button click event. In this case, starting page index would be zero and page size would be 1.

So, something like:

C#

string item = list.Skip(currentpageindex*pagesize).Take(pagesize).Select(x=>x).FirstOrDefault()

should work. You would have to make sure that the page index is a global or a static variable that would retain its most recent value between page switches.

Hope this helps.

_Amy · Answer 3 · 2012-08-04T18:37:00

If you want only one row from your returned query then change the query itself. Try this query:

SQL

Select DISTINCT * from ExamPaper where TestName = @tn

Or put a break statement after reading first row in your while loop:

C#

while (dr.Read())
{
    txtquestion.Text = Convert.ToString(dr[4]);
    radioBtn1.Text = Convert.ToString(dr[5]);
    radioBtn2.Text = Convert.ToString(dr[6]);
    radioBtn3.Text = Convert.ToString(dr[7]);
    radioBtn4.Text = Convert.ToString(dr[8]);
    break;
}

--Amit

how to get the value from database row wise using ado.net

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