data is not fetch from 2nd id in dropdownlist

Question

0.00/5 (No votes)

See more:

i am trying to read data based on selected id but it reads only 1st id data and when i select 2nd id from dropdownlist it select 1st id data. where is the problem to read data from 2nd id

my code is

C#

protected void Page_Load(object sender, EventArgs e)
{
    //SqlConnection con = new SqlConnection(str);
    SqlConnection con = new SqlConnection(ConfigurationManager .ConnectionStrings["cn"].ConnectionString);  
    
    string com = "select * from abouts";
    SqlDataAdapter adpt = new SqlDataAdapter(com, con);
    DataTable dt = new DataTable();
    adpt.Fill(dt);
    DropDownList1.DataSource = dt;
    DropDownList1.DataBind();
    DropDownList1.DataTextField = "title";
    DropDownList1.DataValueField = "id";
    DropDownList1.DataBind();
}

C#

protected void Button1_Click1(object sender, EventArgs e)
{
   // SqlConnection con = new SqlConnection(str);
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString);  
    SqlCommand cmd = new SqlCommand("select * from abouts where id = '" + DropDownList1.SelectedValue + "'", con);
    SqlDataAdapter Adpt = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    Adpt.Fill(dt);
    GridView1.DataSource = dt;
    GridView1.DataBind();
    Label1.Text = "record found";
}

tell me where is the problem to read data based on 2nd id.

Posted 23-Jul-12 23:52pm

chander_rani

Updated 24-Jul-12 0:02am

_Amy

v2

Add a Solution

Comments

dimpledevani 24-Jul-12 6:00am

You hav not used isposback method so, your dropdownlist is reloding and bydefalut first item is selected

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)

Prasad J · Answer 1 · 2012-07-24T00:02:00

When you click the Button1, at first page load event fires, so your dropdown list will get reset by fetching its values from the database.

Try to put a checking, whether its postback or not.

C#

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
            {
//SqlConnection con = new SqlConnection(str);
SqlConnection con = new SqlConnection(ConfigurationManager .ConnectionStrings["cn"].ConnectionString);
 
string com = "select * from abouts";
SqlDataAdapter adpt = new SqlDataAdapter(com, con);
DataTable dt = new DataTable();
adpt.Fill(dt);
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
DropDownList1.DataTextField = "title";
DropDownList1.DataValueField = "id";
DropDownList1.DataBind();
}
}

_Amy · Answer 2 · 2012-07-24T00:05:00

Hi,
Try the following:

C#

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack){
       fnBindDDL();
    }
}
private void fnBindDDL()
{
    //SqlConnection con = new SqlConnection(str);
    SqlConnection con = new SqlConnection(ConfigurationManager .ConnectionStrings["cn"].ConnectionString);  
    
    string com = "select * from abouts";
    SqlDataAdapter adpt = new SqlDataAdapter(com, con);
    DataTable dt = new DataTable();
    adpt.Fill(dt);
    DropDownList1.DataSource = dt;
    DropDownList1.DataBind();
    DropDownList1.DataTextField = "title";
    DropDownList1.DataValueField = "id";
    DropDownList1.DataBind();
}
protected void Button1_Click1(object sender, EventArgs e)
{
   // SqlConnection con = new SqlConnection(str);
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString);  
    SqlCommand cmd = new SqlCommand("select * from abouts where id = '" + DropDownList1.SelectedValue + "'", con);
    SqlDataAdapter Adpt = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    Adpt.Fill(dt);
    GridView1.DataSource = dt;
    GridView1.DataBind();
    Label1.Text = "record found";
}

---Amit

bbirajdar · Answer 3 · 2012-07-24T00:06:00

Corrected code

C#

protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostback)//I ADDED THIS LINE
{
//SqlConnection con = new SqlConnection(str);
SqlConnection con = new SqlConnection(ConfigurationManager .ConnectionStrings["cn"].ConnectionString); 
 
string com = "select * from abouts";
SqlDataAdapter adpt = new SqlDataAdapter(com, con);
DataTable dt = new DataTable();
adpt.Fill(dt);
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
DropDownList1.DataTextField = "title";
DropDownList1.DataValueField = "id";
DropDownList1.DataBind();
}
}

data is not fetch from 2nd id in dropdownlist

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0