SQL Select query of more than one value of a same Attribute

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I have a Sql Database with many attributes. From there i want to take all the value of question attribute in an array named getQuestion Here Is my code

C#

vcon.Open();
  SqlCommand cmd = new SqlCommand("select question from examQuestion where tchId='123'", vcon);
  SqlDataReader dr = cmd.ExecuteReader();
  String[] getQuestion = { "" };
  int i = 0;

  while (dr.Read())
  {
      getQuestion[i] = dr.GetString(0);
      i++;
  }
  vcon.Close();

It is fine when database contain single value, But when database has more then one value it provide an Error "Index was outside the bounds of the array". What is the problem? Please Help me. I am very new at ASP.Net.

Posted 20-Jul-13 5:15am

sazzad37

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[no name] 20-Jul-13 11:27am

Your getQuestion array only contains room for a single element because that is all you dimensioned it for. Use a List instead.

2 solutions

Solution 1

Try this way:

C#

vcon.Open();
SqlCommand cmd = new SqlCommand("select question from examQuestion where tchId='123'", vcon);
SqlDataReader dr = cmd.ExecuteReader();
ArrayList getQuestion = new ArrayList();
int i = 0;

while (dr.Read())
{ 
    getQuestion.Add((string)dr["question"]);//or getQuestion.Add((string)dr[0]);
}
vcon.Close();

Posted 20-Jul-13 5:35am

Kuthuparakkal

Comments

sazzad37 20-Jul-13 11:44am

ArrayList provides Reference Error.

sazzad37 20-Jul-13 11:47am

getQuestion[0] is not allowed.

Kuthuparakkal 20-Jul-13 11:50am

Post the full piece of code

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Zafar A khan · Accepted Answer · 2013-07-20T18:42:00

use Generic List the Easy way

vcon.Open();
          SqlCommand cmd = new SqlCommand("select question from examQuestion where tchId='123'", vcon);
          SqlDataReader dr = cmd.ExecuteReader();
           System.Collections.Generic.List<string> LstQuestion = new System.Collections.Generic.List<string>();

          while (dr.Read())
          {
              LstQuestion.Add(dr.GetString(0));

          }
          vcon.Close();