how to fill dropdownlist in asp.net and c#

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Hello,
I have written the following code to fill the dropdownlist 'ddlstuid'.
The following code gives me an error: "The best overloaded method match for ddlstuid has some invalid arguments". Pls tell me how else can i fill a dropdownlist in asp.net using c# code.

C#

SqlConnection myconn;
SqlCommand cmd;
string str = "Data Source=TIMSCDR\\SQLEXPRESS;Initial Catalog=IAP;Integrated Security=True";
SqlDataReader dr;

     try
    {
        cmd = new SqlCommand("select stuid from attendance", myconn);
        myconn.Open();
        ddlstuid.Items.Clear();
        dr = cmd.ExecuteReader();
        if (dr != null)
        {
            while (dr.Read())
            {
                ddlstuid.Items.Add(dr["stuid"]);
            }
        }
        myconn.Close();
    }
    catch (Exception e1)
    {
        Label45.Text = "Error ocurred" + e1;
    }

Posted 5-Jun-11 20:01pm

debo_india

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cuteband 6-Jun-11 2:03am

ddlstuid.Items.Add(dr["stuid"].tostring());
Convert this into the String

debo_india 6-Jun-11 2:04am

thanx now no error is coming!!thanx a lot!! :)

cuteband 6-Jun-11 2:06am

please vote on me

3 solutions

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prem shanker verma · Accepted Answer · 2011-06-05T20:15:00

Solution 3

you need to convert dr["stuid"]) into string as:

dr["stuid"]).toString()

Posted 5-Jun-11 20:15pm

prem shanker verma

Comments

debo_india 6-Jun-11 2:21am

thanx i converted it just now into string. the error is not coming anymore :)

OriginalGriff · Accepted Answer · 2011-06-05T20:14:00

There are a number of ways to do this:
1) You could use a DataAdapter and DataTable:

C#

SqlDataAdapter da = new SqlDataAdapter("SELECT stuid FROM attendance", myconn);
DataTable dt = new DataTable();
da.Fill(dt);
ddlstuid.Items.Clear();
ddlstuid.DataSource = dt;

2) You could construct a list and use that:

C#

try
    {
    cmd = new SqlCommand("select stuid from attendance", myconn);
    myconn.Open();
    ddlstuid.Items.Clear();
    dr = cmd.ExecuteReader();
    List<object> list = new List<object>();
    if (dr != null)
        {
        while (dr.Read())
            {
            list.Add(dr["stuid"]);
            }
        }
    myconn.Close();
    ddlstuid.DataSource = list;
    }
catch (Exception e1)
    {
    Label45.Text = "Error ocurred" + e1;
    }

Personally, I prefer the former...

cuteband · Accepted Answer · 2011-06-05T20:06:00

Solution 1

C#

ddlstuid.Items.Add(dr["stuid"].tostring());
 Convert this into the String

Posted 5-Jun-11 20:06pm

cuteband