Getting data from MS Access database and display it in a listbox

Question

How do I read data in ms access database and display it in a listbox. I have the codes here but i got errors.

 private void button3_Click(object sender, Even         


        

Answer 1

Thy using a While loop

while(reader.Read())
{
   listbox1.Items.Add(reader["FirstName"]);
}

This moves through all the rows you selected. reader.Read() returns false if there are no more rows.

Also: if you Want to retrive valmue from a column I suggest you do it with the index ón the reader instance. Like my example.

var value = reader["ColumnName"];

This increases readability comparing to

var value = reader.GetString(0);

UPDATE

If you want to only display the fist value - I suggest you use cmd.ExecuteScalar() and the adapt you sql to only return the value you need:

using(OleDbCommand cmd = new OleDbCommand("SELECT firstname from TableAcct", conn))
{
   conn.Open();
   var firstName = cmd.ExecuteScalar();
}

Be aware the this will give you the first "FirstName" in the table. And since there is no "order by firstname" or "where someKey = 1" - this might not rturn that you expected.