Row back color property changed but not showing on row.

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C#

I have datagridview(dgv) in windows form application I need to set its back color to white in one method and i did it ,I cheked in debugging the expected row color changed but not showing in dgv ,what could be the reason behind this?

here is the code,

What I have tried:

//////Row color changing here///////

        public void _timer_Tick(object sender, EventArgs e)
        {
            try
            {
                if (flagwithoutprocess == true)
                {
                    Appendlblmflash("Indent Discarded , send another indent");
                 
                    foreach (DataGridViewRow row in dataGridView1.Rows)
                    {
                        if (row.Index == indexxbox)
                        {
                            for (int i = 0; i <= row.Cells.Count - 1; i++)
                            {
                                row.Cells[i].Style.BackColor = Color.White;
                            }
                        }
                    }
                    flagwithoutprocess = false;
                }
             }
    }

////event where traced colors and change as expected///


private void dataGridView1_CellContentClick(object sender,DataGridViewCellEventArgs e)
        {
            try
            {
                var senderGrid = (DataGridView)sender;

                ///summary///
                ///for checkbox column///
                
                if (senderGrid.Columns[e.ColumnIndex] is DataGridViewCheckBoxColumn && e.RowIndex >= 0)
                {

                  indexxbox = e.RowIndex;

                  foreach (DataGridViewRow row in dataGridView1.Rows)
                  {
                     
                      if (row.DefaultCellStyle.BackColor == Color.Aqua)
                      {
                          row.DefaultCellStyle.BackColor = Color.Aqua;
                      }
                      
                      row.Cells[SerialNo.Name].Value = false;
                  }

                       if (dataGridView1.CurrentCell is DataGridViewCheckBoxCell)
                       {
                           
                           //Below code for getting checked value of checkbox
                           bool isChecked = (bool)dataGridView1[e.ColumnIndex, e.RowIndex].EditedFormattedValue;

                           // Checking value of checkbox
                           if (isChecked == true)
                           {
                               data = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
                               fm = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
                               to = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();
                              
                               //changing color of selected row
                               var r = this.dataGridView1.Rows[e.RowIndex];

                              r.DefaultCellStyle.BackColor = Color.Aqua;
                           }
                        
                           ifile.IniWriteValue("Config Section", "INDENT_NO", data);
                           txtindentcode.Text = data;
                       }
                }
            }
       }

EDITED SOLUTION :

by changing code as follows timer event is same as above changes is in only dgv event,

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
try
{
var senderGrid = (DataGridView)sender;

///summary///
///for checkbox column///

if (senderGrid.Columns[e.ColumnIndex] is DataGridViewCheckBoxColumn && e.RowIndex >= 0)
{
indexxbox = e.RowIndex;

foreach (DataGridViewRow row in dataGridView1.Rows)
{
for (int k = 0; k <= row.Cells.Count - 1; k++)
{
if (row.Cells[k].Style.BackColor == Color.Aqua)
{
for (int n = 0; n <= row.Cells.Count - 1; n++)
{
row.Cells[n].Style.BackColor = Color.White;
}
}
}
row.Cells[SerialNo.Name].Value = false;
}

if (dataGridView1.CurrentCell is DataGridViewCheckBoxCell)
{
bool isChecked = (bool)dataGridView1[e.ColumnIndex, e.RowIndex].EditedFormattedValue;

// Checking value of checkbox

if (isChecked == true)
{
data = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
fm = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
to = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();

//changing color of selected row
var r = this.dataGridView1.Rows[e.RowIndex];

for (int n = 0; n <= r.Cells.Count - 1; n++)
{
r.Cells[n].Style.BackColor = Color.Aqua;
}

}
//Below code for getting checked value of checkbox

ifile.IniWriteValue("Config Section", "INDENT_NO", data);
txtindentcode.Text = data;
}

}

///summary///
///for button column///

if (senderGrid.Columns[e.ColumnIndex] is DataGridViewButtonColumn && e.RowIndex >= 0)
{
string msg = "Alert";
string cap = "Do you want to send indent to device?";
DialogResult dlgg = MessageBox.Show(cap, msg, MessageBoxButtons.YesNo, MessageBoxIcon.Question);

if (dlgg == DialogResult.Yes)
{
if (mode == 0)
{
if (lblmflash.Text != "Device processing... please don't send indent")
{
indexxbutton = e.RowIndex;

if (indexxbutton == indexxbox)
{
if (flagwithoutprocess == false)
{
if (networkStream != null)
{
isButtonClicked = true;

indata = ifile.IniReadValue("Config Section", "INDENT_NO");

if (isButtonClicked == true)
{
string query = " SELECT item_code ,required_quantity " +
" FROM vw_DSInfo_indent_details " +
" WHERE indent_no = @ind " +
" AND indent_status like 'Approved' " +
" AND pending_qty not like '0%' ;";

cmd = new MySqlCommand();
cmd.CommandText = query;
cmd.CommandType = CommandType.Text;
cmd.Parameters.Add(new MySqlParameter("ind", indata));
cmd.Connection = con;
table = new DataTable();
adapter = new MySqlDataAdapter(cmd);
adapter.Fill(table);

if (table.Rows.Count > 0)
{
List<string> code = new List<string>();
int h = 1;

foreach (DataRow row in table.Rows)
{
string itemcode = row["item_code"].ToString();
string[] reqqty = row["required_quantity"].ToString().Split('.');

code.Add(itemcode + "," + reqqty[0] + ",&*");

if (h == 200 || h == 400 || h == 600 || h == 800 || h == 1000 || h == 1200 || h == 1400)
{
code.Add("`");
}
h++;
}

string onestr = string.Join("", code);
byte[] garbage = Encoding.ASCII.GetBytes("aaaaa");
networkStream.Write(garbage, 0, garbage.Length);

Thread.Sleep(500);

byte[] request = Encoding.ASCII.GetBytes("INDENT_REQ");
networkStream.Write(request, 0, request.Length);

byte[] fulldata = Encoding.ASCII.GetBytes(onestr);
networkStream.Write(fulldata, 0, fulldata.Length);

hash = Encoding.ASCII.GetBytes("#");
networkStream.Write(hash, 0, hash.Length);

ifile.IniWriteValue("Config Section", "INDENT_NO", "");

Appendlblmflash("");

foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (Convert.ToBoolean(row.Cells[SerialNo.Name].Value) == true)
{
for (int i = 0; i <= row.Cells.Count - 1; i++)
{
row.Cells[i].Style.BackColor = Color.LightSalmon;
}
}
row.Cells[SerialNo.Name].Value = false;
}

}

else
{
unscr = Encoding.ASCII.GetBytes("%");
networkStream.Write(unscr, 0, unscr.Length);
hash = Encoding.ASCII.GetBytes("#");
networkStream.Write(hash, 0, hash.Length);
string mmsg = "Alert";
string caption = "No items present for this Indent";
MessageBox.Show(caption, mmsg, MessageBoxButtons.OK, MessageBoxIcon.Warning);

foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (Convert.ToBoolean(row.Cells[SerialNo.Name].Value) == true)
{
for (int i = 0; i <= row.Cells.Count - 1; i++)
{
row.Cells[i].Style.BackColor = Color.LightSalmon;
}
}

row.Cells[SerialNo.Name].Value = false;
}

ifile.IniWriteValue("Config Section", "INDENT_NO", "");
}
}
else // isbuttonclick else
{ }
}

else // network stream else
{
string mess = "Connection Status";
string caption = "Device not connected! Connect Device properly.";
MessageBox.Show(caption, mess, MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
}
}
else { } // flag withoutprocess
}
else // indexx not match else
{
//clicked cha ahe jithe sangach ahe wrong button clicked ahe mnun
string mess = "Process Alert";
string caption = "Wrong Button Pressed! Please Press selected row Button";
MessageBox.Show(caption, mess, MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);

}
// indexxbox = indexxbutton = 0;
}
else
{
string mess = "Process Alert";
string caption = "Device is processing, send indent after some time.";
MessageBox.Show(caption, mess, MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
}
}
else /// else part of indent mode and direct mode
{
string mess = "Process Alert";
string caption = "Device in Direct Transfer mode, Send indent when in Indent Transfer Mode";
MessageBox.Show(caption, mess, MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
}
}
}
}
catch
{}
}