Changing datagridview cell color dynamically

Question

I have a dataGridView object that is populated with data  I want to click a button and have it change the color of the background of the cell  This is what I currently have  foreach DataGridViewRow row in dataGridView1 Rows        foreach DataGridViewColumn col in dataGridView1 Columns                      row Cells col Index  Style BackColor   Color Green    doesn t work               col Cells row Index  Style BackColor   Color Green    doesn t work         dataGridView1 col Index  row Index  Style BackColor   Color Green    doesn t work            ALL of these three cause the table to be redrawn over itself in an overlapping manner and trying to re-size the tables becomes a mess  when clicking on a cell  the value remains highlighted and the backcolor doesn t change    Q  How can I change the backcolor of an individual cell after the table exists

User · Answer

Considere use DataBindingComplete event for update the style  The next code change the style of the cell       private void Grid DataBindingComplete object sender  DataGridViewBindingCompleteEventArgs e                this Grid Rows 2  Cells 1  Style BackColor   Color Green

User · Answer

This works for me  dataGridView1 Rows rowIndex  Cells columnIndex  Style BackColor   Color Red

User · Answer

Thanks it working   here i am done with this by qty field is zero means it shown that cells are in red color          int count   0           foreach  DataGridViewRow row in ItemDg Rows                        int qtyEntered   Convert ToInt16 row Cells 1  Value               if  qtyEntered  lt   0                                ItemDg 0  count  Style BackColor   Color Red   to color the row                 ItemDg 1  count  Style BackColor   Color Red                   ItemDg 0  count  ReadOnly   true   qty should not be enter for 0 inventory                                                  ItemDg 0  count  Value    0    assign a default value to quantity enter             count

User · Answer

Implement your own extension of DataGridViewTextBoxCell and override Paint method like this   class MyDataGridViewTextBoxCell   DataGridViewTextBoxCell       protected override void Paint Graphics graphics  Rectangle clipBounds  Rectangle cellBounds  int rowIndex          DataGridViewElementStates cellState  object value  object formattedValue  string errorText          DataGridViewCellStyle cellStyle  DataGridViewAdvancedBorderStyle advancedBorderStyle  DataGridViewPaintParts paintParts                if  value    null                        if   bool  value                                cellStyle BackColor   Color LightGreen                            else                               cellStyle BackColor   Color OrangeRed                                  base Paint graphics  clipBounds  cellBounds  rowIndex  cellState  value              formattedValue  errorText  cellStyle  advancedBorderStyle  paintParts          Then in the code set CellTemplate property of your column to instance of your class  columns Add new DataGridViewTextBoxColumn    CellTemplate   new MyDataGridViewTextBoxCell

User · Answer

If you want every cell in the grid to have the same background color  you can just do this  dataGridView1 DefaultCellStyle BackColor   Color Green

[c#] Changing datagridview cell color dynamically

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