how to fill dropdownlist in asp.net and c#

Question

0.00/5 (No votes)

See more:

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

Add a Solution

Comments

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

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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

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...

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 :)