Visual Basic - Add line(s) on individual rows in datagridview - Flickering

HI,

This could help

Public Sub SuspendLayout
'Usage
Dim instance As Control

instance.SuspendLayout
' your code
instance.ResumeLayout

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Thank you for your answer! Can you be a little bit more specific?

What do I have to do with my cellpainting code?

The datagridview is filled by a sql query (fill a datatable). I added columns manually and connect the datagridview to a datatable (datasource = datatable) in the form_load.

Hi,

You can try SuspendLayout () before initializing your form and ResumeLayout () after initialization.  Sometimes this doesn't work.  When it doesn't, you can try using the Win32 functions:

Outside of your method:

using Microsoft.Win32;
using System.Runtime.InteropServices;


        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
        private const int WM_SETREDRAW = 11;

 

Before drawing:

            SendMessage(ObjectControlPanel.Handle, WM_SETREDRAW, false, 0);


After drawing:

            SendMessage(ObjectControlPanel.Handle, WM_SETREDRAW, true, 0);


You may then need to call Refresh ().

refer to http://www.c-sharpcorner.com/Forums/Thread/52/

Regards

I tried this methods and it changes nothing unfortunately.

The flickering ("winking") still exist in the line(s).

Can you show us a screenshot so we see what is the outcome of above code?

One change you can make immediately and which might help is to remove the last 3 lines and add following to form_load


datagridview1.Rows(e.RowIndex).DefaultCellStyle.Font = New Font(datagridview1.Font, FontStyle.Bold)

I tried something and this is for me a good solution.