Trying to use drop down list as filter

Question

0.00/5 (No votes)

See more:

.NET4.5

Hello, Thanks for looking at my post. I am trying to use a dropdown list to act as a filter then display the values in a gridview. I looked all over the internet and found several ways. I have not been able to get any of them to work. Here is the code I am using. I am getting an error "Fill: SelectCommand.Connection property has not been initialized."

VB

Dim con As New SqlConnection(my connection to the database)
Dim command As New SqlCommand("select * from grades where test = "      Convert.ToString(Me.DropDownList2.SelectedValue))
Dim dataAadpter As New SqlDataAdapter(command)
con.Open()
Dim ds As New DataSet()
dataAadpter.Fill(ds)
GridView2.DataSource = ds
GridView2.DataBind()
GridView2.Visible = True
con.Close()

Thank-you for your help,

D

Posted 29-Jan-13 8:52am

D-Bar

Updated 29-Jan-13 10:48am

fjdiewornncalwe

v2

Add a Solution

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)

Richard C Bishop · Answer 1 · 2013-01-29T10:04:00

Solution 1

You have not added the connection property. Add this to your code:

Dim command As New SqlCommand("select * from grades where test = '" + Convert.ToString(Me.DropDownList2.SelectedValue) + "'", con)

Posted 29-Jan-13 10:04am

Richard C Bishop

Updated 29-Jan-13 10:55am

v6

AshishChaudha · Answer 2 · 2013-01-29T18:24:00

try this right way of gridview bound

C#

DataTable dt = null;
        using (conn = new SqlConnection(ConfigurationManager.ConnectionStrings["tempdbConn"].ConnectionString))
        {
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandType = CommandType.Text;
                cmd.CommandText = "select row_number() OVER (ORDER BY id) AS sno,id,uname,totalMarks from tmp_table";
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    dt = new DataTable();
                    da.Fill(dt);
                }
            }
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();

Thanks

bhavin tanna · Answer 3 · 2013-01-29T10:24:00

Solution 2

First check condition for dropdown whether it is null or not.

VB

if (DropDownList2 isnot nothing) then


  If (DropDownList2.SelectedValue.ToString.Length > 0) Then
       // put all your fetch code here.
  End If

End IF

Posted 29-Jan-13 10:24am

bhavin tanna