Inserting String into a databound combobox in vb.net

Question

4.00/5 (1 vote)

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Hi all,

Is it possible to insert a string item into a combobox which is being populated from a table?

My code is as follows:

VB

dim dv as dataview
dv = obj.get()
ddlReasons.DataSource = dv.Table
ddlReasons.DisplayMember = dv.Table.Columns("Reason").ToString
ddlReasons.ValueMember = dv.Table.Columns("Reason").ToString

I tried putting in

ddlReasons.Items.Insert(0,"--Please Select--")

but still the combobox only displays the items it retrieved from the table.

Thanks.

Posted 2-Jun-11 20:35pm

AnnSJ

Updated 2-Jun-11 21:19pm

Dalek Dave

v2

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Comments

Karwa_Vivek 3-Jun-11 3:04am

Please Mark Your Solution .It will Help Others Too.
Green Button.
have fun !

Dalek Dave 3-Jun-11 3:19am

Edited for Grammar and Readability.

3 solutions

Solution 2

Or Something Like This

ddlReasons.Items.Add("--Select---")

ddlReasons.DataSource = dv.Table
ddlReasons.DisplayMember = dv.Table.Columns("Reason").ToString
ddlReasons.ValueMember = dv.Table.Columns("Reason").ToString

Posted 2-Jun-11 20:52pm

Karwa_Vivek

v2

Solution 3

Try this

VB

dim dv as dataview
dv = obj.get()

      Dim dr As DataRow
      dr = dv.Table.NewRow()
      dr("ID") = 0
      dr("name") = "--Please Select--"
      dv.Table.Rows.InsertAt(dr, 0)
ddlReasons.DataSource = dv.Table
ddlReasons.DisplayMember = dv.Table.Columns("Reason").ToString
ddlReasons.ValueMember = dv.Table.Columns("Reason").ToString

Posted 2-Jun-11 21:00pm

Savalia Manoj M

Updated 2-Jun-11 21:20pm

v2

Comments

Dalek Dave 3-Jun-11 3:20am

Edited for Code Block.

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Abhinav S · Accepted Answer · 2011-06-02T20:45:00

Solution 1

Whenever I need to do this, I do it at the query level.
It makes my code most consistent.
Say my query to populate the dropdown is

Select name, id from myTable

I add a union clause to that.

Select name, id from myTable
Union
Select '---Please Select---', 0

.
That usually works.

Posted 2-Jun-11 20:45pm

Abhinav S

Comments

AnnSJ 3-Jun-11 3:07am

thanks... this works fine!

Abhinav S 3-Jun-11 3:12am

You are welcome.

Member 2393256 23-Mar-13 11:33am

That's the way to do it!!! Thanks!!!