public Form1()
        {
            InitializeComponent();
            LoadData();

        }

        private void LoadData()
        {
            DataTable tblDatas = new DataTable();
            tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));

            tblDatas.Columns.Add("Name", Type.GetType("System.String"));
            tblDatas.Columns.Add("Version", Type.GetType("System.String"));
            tblDatas.Columns.Add("Age", Type.GetType("System.String"));
            tblDatas.Rows.Add(new object[] { 1, "a", "b", "12" });
            tblDatas.Rows.Add(new object[] { 2, "a", "b", "15" });
            tblDatas.Rows.Add(new object[] { 3, "a", "b", "30" });
            tblDatas.Rows.Add(new object[] { 4, "a", "b", "25" });
            tblDatas.Rows.Add(new object[] { 5, "a", "b", "30" });

            dataGridView1.DataSource = tblDatas;
        }

 private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex > -1)
            {
                int intGrade = Convert.ToInt32(this.dataGridView1.Rows[e.RowIndex].Cells["dgvAge"].Value);
                if (intGrade ==30)
                {
                    dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.Red;
                }
                else if(intGrade==25)
                {
                    dataGridView1.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.Brown;
                }
            }
        }
 

效果圖如下：