DatagridView Cell border style based on cell contents in C#.

You can use cell's CssClass property and set background-color inside css class.

Alternately, you can below code.

this.gamesDataGridView[COL_ID_4Q, i].Style.Add("background-color", "#FFF000");

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Change the color code to whatever color you want.

Also add below line to change border style

this.gamesDataGridView[COL_ID_4Q, i].Style.Add("border", <border setting value>);

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I forgot to mention that this is a Windows Form so CSS and Style.Add are not an option....

I did find this class online that looks like it would do what I want but I don't know how to apply it to my cell. I'm relatively new to C# ....

 class CustomDataGridViewCell : DataGridViewTextBoxCell
    {
        private DataGridViewAdvancedBorderStyle _style;

        public CustomDataGridViewCell() : base()
        {
            _style = new DataGridViewAdvancedBorderStyle();
            _style.Bottom = DataGridViewAdvancedCellBorderStyle.Inset;
            _style.Top = DataGridViewAdvancedCellBorderStyle.Inset;
            _style.Left = DataGridViewAdvancedCellBorderStyle.Inset;
            _style.Right = DataGridViewAdvancedCellBorderStyle.Inset;
        }

        public DataGridViewAdvancedBorderStyle AdvancedBorderStyle
        {
            get { return _style; }
            set
            {
                _style.Bottom = value.Bottom;
                _style.Top = value.Top;
                _style.Left = value.Left;
                _style.Right = value.Right;
            }
        }

        protected override void PaintBorder(Graphics graphics, Rectangle clipBounds, Rectangle bounds, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle)
        {
            base.PaintBorder(graphics, clipBounds, bounds, cellStyle, _style);
        }

        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)
        {
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, _style, paintParts);
        }

    }

Well I managed to get my function to work and now these four cells have borders and look like text boxes.

this.gamesDataGridView[COL_ID_1Q, i] = new CustomDataGridViewCell();
this.gamesDataGridView[COL_ID_2Q, i] = new CustomDataGridViewCell();
this.gamesDataGridView[COL_ID_3Q, i] = new CustomDataGridViewCell();
this.gamesDataGridView[COL_ID_4Q, i] = new CustomDataGridViewCell();

but now I have a slightly different problem, when I click in the cell the borders disappear, then I click the next cell and the borders of the original cell come back but the bottom border is missing. This happens for every cell that I click in. How do I keep the borders from disappearing?

I found the solution myself and posted it as well.