About Combobox

About Combobox

• _Michael Fischer_

  Sorry i couldn't understand rigth. I have one combobox, label and textbox. And my database in access. there is 28 Columns and 400 rows. Can you write example code for me.

   

  SqlCommand cmd = new SqlCommand("SELECT * FROM Table1 WHERE asd = '" + comboBox1.Text + "'", con); ' i connected combobox to my db
              SqlDataReader reader = cmd.ExecuteReader(); ' search what i select in combo
              if (reader.Read()) {
                  label1.Text = reader["field1"].ToString(); ' this is selected item value
                  label2.Text = reader["field2"].ToString(); ' thsi is column of selected item value 
              }
              reader.Close();

   

   

  did i understand right

  
   

  
  
  

• vka

  Hi,
  
  If you wanna change to the next cell, then you'll have to change the value member text to the field that you want to show.
  
  combobox1.DataSource = myDataSet
  combobox1.DisplayMember = "asd"
  combobox1.ValueMember = "sakd"
  
  And on your combobox selectedindex changed do this:
  
  TextBox1.Text = combobox1.SelectedValue
  Label1.Text = combobox1.ValueMember
  
  
  
  cheers,
  
  Paul June A. Domag
  
  
  

• BenziZbit

  hi,

  he wrote the code in the c fashon anyway in visual basic you have to define somethings if you use the wizards

  double click your combobox in your form and when you go to codeview put this code

  dim con as new sqlconnection("put the text of your connection here")

  dim sqlstring as string = "select all from MytableName where asad = "& combobox1.selecteditem & "'"

  dim cmd as new sqlcommand(sqlstring, conn)

  dim reader as sqldatareader = cmd.executereader()

  while reader.read()

  label1.text = reader("OneOfYourColumenNameThatYouWant")

  label2.text=reader("YourOtherColumnNameThatYouWant")

  end while

  close.reader()

  
  
  

• Nethol

  Hi,
  
  You can do that this way. Upon binding your combobox to your datatable or dataset:
  
  combobox1.DataSource = myDataSet
  combobox1.DisplayMember = "asd"
  combobox1.ValueMember = "312sad"
  
  And on your combobox selectedindex changed do this:
  
  TextBox1.Text = combobox1.SelectedValue
  Label1.Text = combobox1.ValueMember
  
  
  
  cheers,
  
  Paul June A. Domag
  
  
  

• nyquist58

   

  thx Mr. Paul

  
  
  

• bojingo

  My DB is called PhilDataSet
  I want to use a text value(I can use the index value if necessary) selected from a combobox(working) in a form as the WHERE part of an SQL statement that returns the columns "Cards" and "Hand_Group" from my PhilDataSet DB into text boxes with the intention later of manipulating some of that data to pull other stuff from a second DB.
  
  Where I'm running into trouble is getting just my WHERE data to come out of the DB. I can get the whole DB table to show in my form, but not the specific data when I add the WHERE argument to the SELECT and FROM statements. I'm doing a lot of data "echoing" to verify I'm getting the values out that I'm intending to. Here's some of the code with the error I'm currently getting listed just below the line where it occurs, in Red:
  
  Dim strCardSql As String = "SELECT all FROM Dealt_Cards WHERE Cards = " & comboMyHand.SelectedItem & "'"
  Dim cmdCards As New OleDb.OleDbCommand(strCardSql, cardConn)
  Dim readerCards As OleDb.OleDbDataReader()
  'THE ERROR I Get from the line above is: "The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect."
  If readerCards.Read() Then
  Label4.Text = readerCards("Cards")
  'returns the WHERE value in the Cards column to my form
  Label5.Text = readerCards("Group")
  'returns the WHERE value from the Group column to my form
  End If
  readerCards.Close()
  
  I think if I can figure out what goes in the ()'s I'll be ok, but after a day of reading online, I've not figured it out yet. I've tried a few combos so far to no avail, getting a few other errors.
  
  Thanks for any help,
  Jet

  
  
  

• WtBck

  hi,

  i'm still learning like you and i'm not sure from this but try this out

  combobox1.DataSource = myDataSet
  combobox1.DisplayMember = "asd"
  combobox1.ValueMember = "312asd" &"|"& "sakd"

  and in your compobox selectedindex add this code

  Dim Keys() as string

  keys = spilit(combobox1.valuememeber, "|")

  textbox1.tet = combobox1.selecteditem

  label1.text =  keys(0) + vbnewline

  label1.text &= keys(1)

  
  
  

• preed

  Hi,

  The previous texteditor which contains the C#/VB code button has already been replaced by the texteditor that you now use in the forum. Although it doesn't support the VB/C# code blocks, the new editor greatly supports the cut and paste from the VS IDE.

  Here;s the thread that discusses it.  http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=80569&SiteID=1

   

  cheers,

  Paul June A. Domag

  
  
  

• Aran

  what happen if i want to see two colomns at the same time based on the selection that the user has made so can i still use the .value member since it only can be used once right
  

• Earl Bonovich

  hi,

  you are welcome paul,  from the number of your posts i see you as expert here in this forum and i have aquestion for you,

  first time i came here i saw icon about if this posting contain a code(vb/c#) now i don't see it anymore to mark the code in my posting so don't you know how i can get this back

  thx

  
  
  

• skweaz

  Thanks you for your help.one more question.if i wanna show next value then 13, you remember my table. If i wanna show other number how can i do that my mean next cell.
  
  

• Mungos

  Hi,
  
  

  rockzcm wrote:

  what happen if i want to see two colomns at the same time based on the selection that the user has made so can i still use the .value member since it only can be used once right

  
  
  Yep the value member could only be used once. You'll have to create some codes to enable that. Here's an example:
  
              SqlCommand cmd = new SqlCommand("SELECT * FROM Table1 WHERE asd = '" + comboBox1.Text + "'", con);
              SqlDataReader reader = cmd.ExecuteReader();
              if (reader.Read()) {
                  label1.Text = reader["field1"].ToString();
                  label2.Text = reader["field2"].ToString();
              }
              reader.Close();
  
  
  cheers,
  
  Paul June A. Domag
  
  
  
  
  

• Pdoh

  Thanks for your help but. It didn't work. All the time give so much errors. I'm using Visual Stuido 2003 Visual Basic Express Edition. (FreeWare)
  
  

• JS26

  Hi,
  
  Thanks shakalama for converting my code. I kinda forgot that this is a VB forum. Here's a convertion of the code:
  
  

  dim con as new sqlconnection("put the text of your connection here")

  dim sqlstring as string = "select all from MytableName where asad = "& combobox1.selecteditem & "'"

  dim cmd as new sqlcommand(sqlstring, conn)

  dim reader as sqldatareader = cmd.executereader()

  if reader.read() then
  

  label1.text = reader("OneOfYourColumenNameThatYouWant")

  label2.text=reader("YourOtherColumnNameThatYouWant")

  end if
  

  close.reader()

  
  you can just modify the code to satisfy your needs...
  
  
  
  cheers,
  
  Paul June A. Domag
  
  
  
• About Combobox