Row blink based on condition for DataGridView using C# in Windows Forms Application

Hi raiamit,

After trying a lot i conclude that it is not possible without timer. Here i have created a sample as per your need.

Please refer the below code. Here i have checked with country Finland. So you need to change as per your condition.

C#

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        BindGrid();
    }

    private void dataGridView1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
    {
        timer1.Start();
        Thread thread = new Thread(Blink);
        thread.Start();
    }

    bool go = false;
    int count = 100;

    private void Blink(object o)
    {
        while (count > 0)
        {
            while (!go)
            {
                foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    if (row.Cells[2].Value.ToString().ToUpper() == "FINLAND")
                    {
                        row.DefaultCellStyle.BackColor = Color.Red;
                    }
                }
                go = true;
                Thread.Sleep(500);
            }

            while (go)
            {
                foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    if (row.Cells[2].Value.ToString().ToUpper() == "FINLAND")
                    {
                        row.DefaultCellStyle.BackColor = Color.Green;
                    }
                }
                go = false;
                Thread.Sleep(500);
            }
        }
    }

    private void BindGrid()
    {
        string constring = @"Data Source=.;Initial Catalog=Northwind;User id = sa;password = sa";
        using (SqlConnection con = new SqlConnection(constring))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT TOP 10 * FROM Customers", con))
            {
                cmd.CommandType = CommandType.Text;
                using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
                {
                    using (DataSet ds = new DataSet())
                    {
                        sda.Fill(ds);

                        //Set AutoGenerateColumns False
                        dataGridView1.AutoGenerateColumns = false;

                        //Set Columns Count 
                        dataGridView1.ColumnCount = 3;

                        //Add Columns
                        dataGridView1.Columns[0].Name = "CustomerId";
                        dataGridView1.Columns[0].HeaderText = "Customer Id";
                        dataGridView1.Columns[0].DataPropertyName = "CustomerID";

                        dataGridView1.Columns[1].HeaderText = "Contact Name";
                        dataGridView1.Columns[1].Name = "Name";
                        dataGridView1.Columns[1].DataPropertyName = "ContactName";

                        dataGridView1.Columns[2].Name = "Country";
                        dataGridView1.Columns[2].HeaderText = "Country";
                        dataGridView1.Columns[2].DataPropertyName = "Country";
                        dataGridView1.DataSource = ds.Tables[0];
                    }
                }
            }
        }
    }
}

Screenshot