Highlight Grid View Row based on second SQL query results - asp.net

Question

I am working with ASP.NET and VB.NET in code behind. My question is this:
I have a grid view (Called gvSecondLevel) that is loaded based on query A. (It works fine) The grid view can have anywhere from 1 to X number of rows. There is a Command Button for every row in column zero of gvSecondLevel that when clicked will display another grid view (Called gvThirdLevel) which will display 1 to X number of rows for the line number in gvSecondLevel.
In the gvThirdLEvel there is column called OpComplete, it is either 0 (No) or 255 (Yes). So lets say that gvSecondLevel has 2 lines. For Line 1 there are three lines in the gvThirdLevel, and for gvSecondLevel line 2 there are 4 lines in gvThirdLevel.
Now assume that for gvSecondLevel Line 1 that all OpComplete steps (In gvThirdLEvel) are 255 or Complete.
But for gvSecondLevel Line 2 lets say that the third line (of the four lines) of gvThirdLevel has an OpComplete step that is a 0 but lines 1,2, & 4 are all complete or 255.
What I need to do is have line 2 in gvSecondLevel highlighted because of the third line in gvThirdLevel OpComplete being 0. The kicker is that the gvThirdLevel is not visible UNTIL the user has clicked a line number in gvSecondLevel.
So in essence I need to some how look at all the lines that would be retrieved by the gvThidLevel query for each line in gvSecondlevel and highlight it so that a user knows that a particular line has a problem.
Right now the gvSecondLevel loads but no lines are highlighted. Can anyone point in a direction so that I can try and learn how to do this? Or if by some miracle someone has already had to do this and can share some code that also would work so I can see how it is done.
Update
gvSecondLvl
____________________________________________________________________________
| |Line # | Part Description | PCS | Weight | Sq Foot | Comments |
____________________________________________________________________________
|[cmdButton]| 1 | Part blah blah | 100 | 1,200 | 254 | |
____________________________________________________________________________
|[cmdButton]| 2 | Part blah blah 2 | 50 | 1,500 | 125 | |
____________________________________________________________________________
This loads fine. When someone clicks the cmdButton for a specific line number the gvThirdLvl is Displayed, lets say line 2
gvThirdLvl
___________________________________________________________________________
| Step Comp | Assembly | OP # | WC Code | Due Date | Qty | Qty Completed |
___________________________________________________________________________
| Yes | 0 | 100 | MTLH | 6/12/2017 | 25 | 25 |
___________________________________________________________________________
| No | 0 | 110 | PC | 6/14/2017 | 100 | 0 |
___________________________________________________________________________
Remember that the gvThirdLvlv will not be displayed until the line 2 command button in gvSecondLvl is clicked. But when gvSecondLvl loads I need (in this case) line 2 to be highlighted before any line numbers is clicked. That way the users can see that line 2 (in this case) is the reason that this order is on the report.

Answer 1

If you are populating the rows when you click the button you can set the row background color on the data bind event. Then if the row that is being bound matches your criteria you can highlight it.
Private Sub GridView_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView.RowDataBound, additionalGridView.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
If CType(e.Row.FindControl("Line_1"), TextBox).Text = "0" Then
e.Row.BackColor = Color.Red
End If
End If
End Function

Answer 2

This is how I finally managed to get it work.
For i As Integer = 0 To gvDetailSecondLevel.Rows.Count - 1
'If gvDetailSecondLevel.Rows(i).Cells(1).Text.ToString > "0" Then
Dim jNumber As String = lblSONum.Text
Dim lNumber As String = gvDetailSecondLevel.Rows(i).Cells(1).Text.ToString
Dim soNumber As String = jNumber & "." & lNumber
Using conn As New SqlConnection(myConnection2)
conn.Open()
Using sqlCmd As New SqlCommand
sqlCmd.CommandText = ("Select jo.OpComplete From JobOper jo Where jo.JobNum = #JobNum")
sqlCmd.Parameters.AddWithValue("#JobNum", soNumber)
sqlCmd.Connection = conn
Using sqlDa As New SqlDataAdapter(sqlCmd)
Using sqlDT As New DataTable()
sqlDa.Fill(sqlDT)
For Each row As DataRow In sqlDT.Rows
If row.Item(0) = "0" Then
gvDetailSecondLevel.Rows(i).BackColor = Color.Yellow
gvDetailSecondLevel.Rows(i).ForeColor = Color.Red
End If
Next
End Using
End Using
End Using
conn.Close()
End Using
Next
This code is in the gvSecondLvlv DataBound.