Programming visual basic.net 2019

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Dear Please, I ask for your support to solve a problem that I have in the following code:

ERROR: "The input string is not in the correct format"

CLASS:

Public Class Customer

Public Property SUBDEPT As String
Public Property EXISTENCIA As Single

End Class

FILL IN THE DATAGRIDVIEW AND THEN IT WILL BE SENT TO A SQL TABLE:

Dim dt As DataTable = Tables(cboSheet.SelectedItem.ToString())
DataGridView1.DataSource = dt
If dt IsNot Nothing Then
Dim list As List (Of Customer = New List (Of Customer ()
For i As Integer = 0 To dt.Rows.Count - 1
Dim Customer As Customer = New Customer ()
Customer.SUBDEPT = dt.Rows (i) ("SUBDEPT"). ToString ()
Customer.EXISTENCIA = dt.Rows (i) ("EXISTENCIA"). ToString () 'here generates error
list.Add (Customer)
Next
CustomerBindingSource.DataSource = list
End If

Thank You !!!!

What I have tried:

Customer.EXISTENCIA = Convert.ToSingle(dt.Rows (i) ("EXISTENCIA"). ToString ()) 'here generates error

Posted 18-Apr-21 16:42pm

Member 15158443

Updated 18-Apr-21 19:57pm

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[no name] 19-Apr-21 0:52am

I'm guessing EXISTENCIA is a bool, and you're trying to assign a string.

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OriginalGriff · Accepted Answer · 2021-04-18T19:57:00

Never use Convert methods to parse "unverified" data (such as anything generated by a user, or stored in a text field in a database) - they will throw an exception when they meet a problem and that is what you are getting: the content of the column is not a valid single precision number.

We can't fix that - it's a data error and we have no access to your data - so you you need to code your app to be tolerant of such problems or to report such problems so they can be corrected before the data gets anywhere near your DB and starts doing real damage to your data integrity.
Always convert such input with TryParse methods: Single.TryParse Method (System) | Microsoft Docs[^] and report problems instead of continuing blindly!