C changing listbox row color

Question

I am trying to change the background color of some rows in a ListBox  I have two lists that one has names and is displayed in a ListBox  The second list has some similar values as the first List  When clicking a button  I want to search the ListBox and the second List  and change the color of the ListBox for those values that appear in the List  My search in the ListBox is as follows    for  int i   0  i  lt  listBox1 Items Count  i          for  int j   0  j  lt  students Count  j                  if  listBox1 Items i  ToString   Contains students j  ToString                                   But I don t know which method to use in order to change the appearance of a ListBox row  Can anybody help me     EDIT      HI I wrote my code as follows    private void ListBox1 DrawItem object sender  DrawItemEventArgs e        e DrawBackground        Graphics g   e Graphics      Brush myBrush   Brushes Black      Brush myBrush2   Brushes Red      g FillRectangle new SolidBrush Color Silver   e Bounds       e Graphics DrawString listBox1 Items e Index  ToString    e Font  myBrush  e Bounds  StringFormat GenericDefault       for  int i   0  i  lt  listBox1 Items Count  i                  for  int j   0  j  lt  existingStudents Count  j                          if  listBox1 Items i  ToString   Contains existingStudents j                                  e Graphics DrawString listBox1 Items i  ToString                    e Font  myBrush2  e Bounds  StringFormat GenericDefault                                     e DrawFocusRectangle        Now it draws my List in the ListBox  but when I click the button first  it shows in red only the students that are in the List and when I click on the ListBox it  draws all the elements  I want that it will show all the elements   and when I click the button it will show all the elements and the element found in the List in red  Where is my mistake

User · Accepted Answer

I find solution that instead of using ListBox I used ListView It allows to change list items  BackColor   private void listView1 Refresh         for  int i   0  i  lt  listView1 Items Count  i                  listView1 Items i  BackColor   Color Red          for  int j   0  j  lt  existingStudents Count  j                          if  listView1 Items i  ToString   Contains existingStudents j                                  listView1 Items i  BackColor   Color Green

User · Answer

You will need to draw the item yourself   Change the DrawMode to OwnerDrawFixed and handle the DrawItem event        lt summary gt      Handles the DrawItem event of the listBox1 control       lt  summary gt       lt param name  sender  gt The source of the event  lt  param gt       lt param name  e  gt The  lt see cref  System Windows Forms DrawItemEventArgs   gt  instance containing the event data  lt  param gt  private void listBox1 DrawItem  object sender  DrawItemEventArgs e        e DrawBackground       Graphics g   e Graphics          draw the background color you want        mine is set to olive  change it to whatever you want     g FillRectangle  new SolidBrush  Color Olive   e Bounds            draw the text of the list item  not doing this will only show        the background color        you will need to get the text of item to display     g DrawString  THE LIST ITEM TEXT   e Font  new SolidBrush  e ForeColor    new PointF  e Bounds X  e Bounds Y          e DrawFocusRectangle

User · Answer

Once you ve added your listbox item to your form  change DrawMode with OwnerDrawFixed option from the Properties panel  If you forget to do this  none of the codes below will work  Then click DrawItem event from the Events area  private void listBox1 DrawItem object sender  DrawItemEventArgs e          1  Get the item    string selectedItem   listBox1 Items e Index  ToString                               2  Choose font     Font font   new Font  quot Arial quot   12                  3  Choose colour    SolidBrush solidBrush   new SolidBrush Color Red                  4  Get bounds    int left   e Bounds Left     int top   e Bounds Top                             5  Use Draw the background within the bounds    e DrawBackground                   6  Colorize listbox items    e Graphics DrawString selectedItem  font  solidBrush  left  top

User · Answer

I find the solution for listbox items  background to yellow  I  tried the following solution to achieve the output    for  int i   0  i  lt  lstEquipmentItem Items Count  i                                          if   bool ds Tables 0  Rows i   Valid Equipment      false                                                lblTKMWarning Text    Invalid Equipment  amp  Serial Numbers are highlited                            lblTKMWarning ForeColor   System Drawing Color Red                          lstEquipmentItem Items i  Attributes Add  style    background-color Yellow                            Count

User · Answer

First use this Namespace   using System Drawing    Add this anywhere on your form   listBox DrawMode   DrawMode OwnerDrawFixed  listBox DrawItem    listBox DrawItem    Here is the Event Handler   private void listBox DrawItem object sender  DrawItemEventArgs e         e DrawBackground          Graphics g   e Graphics       g FillRectangle new SolidBrush Color White   e Bounds        ListBox lb    ListBox sender       g DrawString lb Items e Index  ToString    e Font  new SolidBrush Color Black   new PointF e Bounds X  e Bounds Y          e DrawFocusRectangle

User · Answer

I think you have to draw the listitems yourself to achieve this   Here s a post with the same kind of question

User · Answer

How about         MyLB is a listbox          Label ll   new Label            ll Width   MyLB Width          ll Content   ss          if     lt some condition gt                  ll Background   Brushes LightGreen          else             ll Background   Brushes LightPink          MyLB Items Add ll

[c#] C# : changing listbox row color?

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