Why does my datagridview flicker (columns shrink and return to their original size)

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C#

Hi everyone,

I have a Datagridview that receives external data and I added 3 columns independent of the external data

My datagridview refreshes every 3 seconds and during the refresh the table flickers (that is to say that the cells shrink and return to their original size) and also the content of the 3 independent columns (those added) disappear and reappear.

I have this problem with this added code (see below which corresponds to an added column), if I delete this piece of code the problem disappears:

var id = row.Cells[0].Value.ToString();
var nickNameTask = Task.Run<string>(async() => await this.GetTraderName(id));
nickNameTask.Wait();
string nickName = nickNameTask.Result;
row.Cells[1].Value =nickName;

Do you know where the problem can come from and how to correct it?

What I have tried:

Here is the code:

<pre lang="C#"><pre> private void dtgvPositions_DataBindingComplete(
          object sender,
          DataGridViewBindingCompleteEventArgs e)
        {
            List<string> lstUID = this.ReplaceDownTheLine(this.txtUIDs.Text.Trim());
            Dictionary<string, bool> lstUIDColor = new Dictionary<string, bool>();
            for (int index = 0; index < lstUID.Count; ++index)
                lstUIDColor.Add(lstUID[index], index % 2 == 0);
            this.dtgvPositions.Invoke((Action)(() =>
            {
                foreach (string str in lstUID)
                {
                    foreach (DataGridViewRow row in (IEnumerable)this.dtgvPositions.Rows)
                    {
                        string key  = row.Cells[0].Value.ToString();
                        Decimal num = 0M;
                        Decimal num1 = 0M;
                        Decimal num2 = 0M;
                        Decimal num3 = 0M;
                        try
                        {
                            num  = Decimal.Parse(row.Cells[9].Value.ToString());
                            num1 = Decimal.Parse(row.Cells[5].Value.ToString());
                            num2 = Decimal.Parse(row.Cells[7].Value.ToString());
                            num3 = Decimal.Parse(row.Cells[3].Value.ToString());


                            var id = row.Cells[0].Value.ToString();
                            var nickNameTask = Task.Run<string>(async() => await this.GetTraderName(id));
                            nickNameTask.Wait();
                            string nickName = nickNameTask.Result;
                            row.Cells[1].Value =nickName;

                            bool flag;
                            lstUIDColor.TryGetValue(key, out flag);
                            row.DefaultCellStyle.BackColor = Color.FromArgb(24, 26, 32);
                            row.Cells[1].Selected = false; 
                            row.Cells[1].Style.ForeColor = flag ? Color.LightSkyBlue : Color.LightPink; 
                            row.Cells[2].Value = num1 >= 0M ? "Long" : "Short";
                            row.Cells[2].Style.ForeColor = num1 >= 0M ? Color.FromArgb(22, 181, 93) : Color.FromArgb(194, 52, 54);
                            row.Cells[6].Value = (num1 * num2) / num3; 
                            row.Cells[9].Style.ForeColor = num >= 0M ? Color.FromArgb(22, 181, 93) : Color.FromArgb(194, 52, 54);
                            row.Cells[10].Style.ForeColor = num >= 0M ? Color.FromArgb(22, 181, 93) : Color.FromArgb(194, 52, 54);
                        }
                        catch
                        {
                        }

                    }
                }
            }));
        }