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How to highlight the first row in a different color without knowing how many columns beforehand in vb.net

Posted on 2016-11-25
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Last Modified: 2016-11-29
Hi all.

I have a Visual Studio project that displays a datagridview control, I created a button that when clicked, it will export the datagridview control results to Excel. I would like to highlight the first row which is the column headers a different color, but the problem is that the number of columns can vary each time the datagridview control is populated with data. Sometimes there will be 7 columns other times there may be 10 etc.

Below is the code I have so far for exporting to Excel. Thank you in advance for any help!

Private Sub btnExcelExport_Click(sender As Object, e As EventArgs) Handles btnExcelExport.Click

        Dim oXLApp As Excel.Application       'Declare the object variables
        Dim oXLBook As Excel.Workbook
        Dim oXLSheet As Excel.Worksheet

        oXLApp = New Excel.Application  'Create a new instance of Excel
        oXLBook = oXLApp.Workbooks.Add  'Add a new workbook
        oXLSheet = oXLBook.Worksheets(1)  'Work with the first worksheet

        oXLApp.Visible = True               'Show it to the user

        With oXLApp
            Dim Col As DataGridViewColumn
            Dim i As Integer = 1
            For Each Col In DataGridView1.Columns
                .Cells(1, i).Value = Col.HeaderText
                i += 1
            Next
            i = 2
            Dim RowItem As DataGridViewRow
            Dim Cell As DataGridViewCell
            For Each RowItem In DataGridView1.Rows
                Dim j As Integer = 1
                For Each Cell In RowItem.Cells
                    .Cells(i, j).Value = Cell.Value
                    j += 1
                Next
                i += 1
            Next

        End With

        'oXLSheet.Range("P:P").EntireColumn.Delete()

        oXLSheet.UsedRange.Borders.LineStyle = 1
        oXLApp.Columns.AutoFit()

        oXLSheet.Range("A:A").Font.Bold = True

        oXLBook = Nothing       'Disconnect from Excel (let the user take over)
        oXLApp = Nothing
        oXLSheet = Nothing

    End Sub

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0
Comment
Question by:printmedia
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6 Comments
 
LVL 51

Expert Comment

by:Rgonzo1971
ID: 41901803
HI,

pls try

For Each Col In DataGridView1.Columns
    .Cells(1, i).Value = Col.HeaderText
    .Cells(1, i).Interior.ColorIndex = 6
    i+= 1
Next

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Regards
0
 

Author Comment

by:printmedia
ID: 41901812
I get an error message stating that "Leading . can only appear inside a With statement"
0
 

Author Comment

by:printmedia
ID: 41901815
When I put your code within the "With" statement it created new columns after the ones with data.
0
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LVL 34

Expert Comment

by:Norie
ID: 41901941
Do you have working code for formatting the headers?
0
 

Author Comment

by:printmedia
ID: 41902308
The code I have is the one I provided in my initial question
0
 
LVL 51

Accepted Solution

by:
Rgonzo1971 earned 500 total points
ID: 41902569
was the new code
Private Sub btnExcelExport_Click(sender As Object, e As EventArgs) Handles btnExcelExport.Click

        Dim oXLApp As Excel.Application       'Declare the object variables
        Dim oXLBook As Excel.Workbook
        Dim oXLSheet As Excel.Worksheet

        oXLApp = New Excel.Application  'Create a new instance of Excel
        oXLBook = oXLApp.Workbooks.Add  'Add a new workbook
        oXLSheet = oXLBook.Worksheets(1)  'Work with the first worksheet

        oXLApp.Visible = True               'Show it to the user

        With oXLApp
            Dim Col As DataGridViewColumn
            Dim i As Integer = 1
            For Each Col In DataGridView1.Columns
                .Cells(1, i).Value = Col.HeaderText
                .Cells(1, i).Interior.ColorIndex = 6
                i += 1
            Next
            i = 2
            Dim RowItem As DataGridViewRow
            Dim Cell As DataGridViewCell
            For Each RowItem In DataGridView1.Rows
                Dim j As Integer = 1
                For Each Cell In RowItem.Cells
                    .Cells(i, j).Value = Cell.Value
                    j += 1
                Next
                i += 1
            Next

        End With

        'oXLSheet.Range("P:P").EntireColumn.Delete()

        oXLSheet.UsedRange.Borders.LineStyle = 1
        oXLApp.Columns.AutoFit()

        oXLSheet.Range("A:A").Font.Bold = True

        oXLBook = Nothing       'Disconnect from Excel (let the user take over)
        oXLApp = Nothing
        oXLSheet = Nothing

    End Sub

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