Question

I am trying to search through my DGV using a Combobox to get the name for the Column and textbox for the search query. I used this code before, and it worked, but now I get an EvaluateException saying

Cannot perform ‘Like’ operation on System.Double and System.String.

Here’s what I’m doing:

Dim dv As DataView = New DataView()
Dim CmSi = cmbSearch.SelectedItem
dv.Table = OutGoingDataSet.outgoingdeliveries
dv.RowFilter = CmSi & " Like '" & txtSearch.Text & "'"
OutgoingDataGridView.DataSource = dv

How do I fix this problem?

Answer 1

Here’s your problem. When you apply your filter you do this check:

Column LIKE 'String'. 

This will work for all columns that are containing strings. Doubles will not work since they are not strings. Basically this would be like

if (5 == "5") 

which of course is false.

So you have to convert your double to a string before doing a LIKE comparison. I cannot tell if it will work or not, but I reckon it will.

dv.RowFilter = "CONVERT(" & CmSi & ", System.String) LIKE '" & txtSearch.Text & "'"