Drop Down Control Help

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SQL-Server-2005

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I have a page on which i have a dropdown which contains distinct usernames from database(username column is unique in database),after selecting a username from it,it fills the gridview on the same page

the problem arising is that after selectinga username,the names doesnot get distinct ie it shows duplicate values for each username in dropdown

Can any one tells me the solution
Code of Getting USers===>

C#

private void LoadUsers()
  {
    DBConnection d = new DBConnection();
    d.OpenConnection();
    SqlCommand select = new SqlCommand();
    select.CommandText = "Select Distinct Username,UserId from tblUser";
    select.Connection  = d.myconn;
    dropdownuser.DataSource = select.ExecuteReader();
    dropdownuser.DataTextField = "Username";
    dropdownuser.DataValueField = "UserId";
    dropdownuser.DataBind();
//Load users
}

Code of DropDown ==>

XML

<asp:DropDownList ID="dropdownuser" runat="server" CssClass="tx_box">
                </asp:DropDownList

Posted 1-Feb-11 0:12am

Syed Salman Raza Zaidi

Updated 1-Feb-11 0:30am

Manas Bhardwaj

v2

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Comments

PunkIsNotDead 1-Feb-11 14:42pm

"Select Distinct Username,UserId from tblUser"... isn't necessary the 'DISTINCT' if UserId column is IDENTITY

3 solutions

Solution 3

There is nothing wrong with dropdown list.
Once test your query in sql by changing like below you will know why you are getting duplicate values..

Select Distinct Username from tblUser

and

Select Distinct UserId from tblUser

Posted 1-Feb-11 0:36am

m@dhu

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Manas Bhardwaj · Accepted Answer · 2011-02-01T00:33:00

Solution 2

You should only load users, if it is not a postback[^].

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LoadUsers();
    }    
}

Posted 1-Feb-11 0:33am

Manas Bhardwaj

Comments

Syed Salman Raza Zaidi 1-Feb-11 6:45am

Excellent Brother

Manas Bhardwaj 1-Feb-11 6:48am

my pleasure :)

Hadi Basiri · Accepted Answer · 2011-02-01T07:44:00

Solution 4

C#

if (!IsPostBack){
      //code here
 }

Posted 1-Feb-11 7:44am

Hadi Basiri