Unable to load data on Select method of Datatable - vb.net

Question

Trying to populate a set of data from datatable to Combobox on the basis of text entered in Combobox. But getting a System.Data.DataRow error in the Select method of datatable.
Following is the code which binds the datatable on Form Load and rebinds data on the call of Search method.
Note that the search has to be on Tab press not AutoComplete
Imports System.Data.SqlClient
Public Class Form1
Dim connection As SqlConnection = New SqlConnection()
Dim table As New DataTable
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
LoadComboBox()
End Sub
Private Sub LoadComboBox()
Dim adp As SqlDataAdapter = New SqlDataAdapter("select stage from sample", connection)
adp.Fill(table)
ComboBox1.DataSource = New BindingSource(table, Nothing)
ComboBox1.DisplayMember = "stage"
End Sub
Private Sub Search()
Dim filteredTable As New DataTable
Dim filterRow As DataRow()
Dim str As String = ComboBox1.Text.Trim
filterRow = table.Select("stage like '%" & ComboBox1.Text.ToString & "%'")
'**Error in above table(datatable)**
For Each rw As DataRow In filterRow
filteredTable.ImportRow(rw)
Next
ComboBox1.DataSource = New BindingSource(filteredTable, Nothing)
ComboBox1.DisplayMember = "stage"
End Sub
Private Sub ComboBox1_PreviewKeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PreviewKeyDownEventArgs) Handles ComboBox1.PreviewKeyDown
If e.KeyCode = Keys.Tab Then
Search()
End If
End Sub
End Class

Answer 1

in your binding to combo box you have a data table already why are you using a binding source
why not just say ComboBox1.DataSource = filteredTable
Also i would advice you to use Key Value Pair rather than using Like easier binding
Like is regex search at SQL Server this is killing your Database and you are creating overhead over nothing
Key | Value >>
ID | Name
so taking this from another stack over flow for fast reference
gridview bind dropdownlist to List<keyvaluePair<int, string>>
you can bind a dictionary , datatable , dataview does not matter.
if you want to get text just say your dropdown.text for the ID value dropdown.value if you want to do something later to in the database.
You can make your drop down read only and when user types basically what he is typing is filtering according to what you have binded that way your text search can be made
var dictionary = new Dictionary<int, string>();
dictionary.Add(1, "Home");
dictionary.Add(2, "Work");
dictionary.Add(3, "Mobile");
dictionary.Add(4, "Fax");
dropDown.DataTextField = "Value";
dropDown.DataValueField = "Key";
dropDown.DataSource = dictionary; //Dictionary<int, string>
dropDown.DataBind();

Answer 2

Tried it with a bit of Linq.
Private Sub Search()
Dim filteredTable As New DataTable
Dim str As String = ComboBox1.Text.Trim
Dim filterRows = (From row As DataRow In Table.AsEnumerable
Where row.Field(Of String)("Name").Contains(ComboBox1.Text)
Select row.Field(Of String)("Name")).ToList
ComboBox1.DataSource = filterRows
End Sub
Just substitute your column name for "Name"