Q:

String was not recognized as a valid DateTime Error when try to sow date and time data into DateTimePicker from DataGridView

I want to display Date and time (format: dd/MM/yyyy h:mm tt) from column "DateTime to DateTimePicker. but it shows an error String was not recognized as a valid DateTime.
Private Sub dgvSchedule_RowEnter(sender As Object, e As DataGridViewCellEventArgs) Handles dgvSchedule.RowEnter
        'DISPLAYS COLUMN VALUE IN TEXTBOXES
        If e.RowIndex >= 0 Then
            Dim row As DataGridViewRow
            row = Me.dgvSchedule.Rows(e.RowIndex)
            txtID.Text = row.Cells("Patient_ID_Number").Value.ToString

            dtpDate.Text = row.Cells("Date_Time").Value 'THIS IS WHERE THE ERROR OCCUR

            txtFirstname.Text = row.Cells("Firstname").Value.ToString
            txtLastname.Text = row.Cells("Lastname").Value.ToString
            txtPhoneNumber.Text = row.Cells("Phone_Number").Value.ToString
        End If
    End Sub

A:

What is the format of your 'Date_Time' column?
If it's a MySQL datetime like this: 2016-01-23 23:30:55 then you can just use the DateTime.Parse of VB.NET
Dim new_date As DateTime = DateTime.Parse("2016-01-23 23:30:55")
DateTimePicker1.Value = new_date

Note that the format is 'Custom' and the CustomFormat is dd/MM/yyyy h:mm tt
DateTimePicker1.Format = DateTimePickerFormat.Custom
DateTimePicker1.CustomFormat = "dd/MM/yyyy h:mm tt"

So the final code could be:
 DateTimePicker1.Format = DateTimePickerFormat.Custom
 DateTimePicker1.CustomFormat = "dd/MM/yyyy h:mm tt"

 Dim new_date As DateTime = DateTime.Parse(row.Cells("Date_Time").Value.ToString())
 DateTimePicker1.Value = new_date

I also noticed that you are using:
dtpDate.Text = row.Cells("Date_Time").Value

instead of 
dtpDate.Value = row.Cells("Date_Time").Value

Note that these are different: Text and Value.

