Find and Replace for all pages

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C#

Hi All,

I'm reading a file into datagridview in chunks. Ex: If a file is having 1000 lines, i'm reading only 100 and after clicking on next button i will get the rest 100 and next....... so on.

I'm having a Find and Replace logic in my form. When i click on it, it's only replacing first 100. For replacing second page, again i have to click on next page and do Find and Repalce.

Below are the codes placed and please suggest me the better way:

Find and Replace:

Form2 f = new Form2();
f.cmbColumnCombo.DataSource = cmbList;
f.ShowDialog();


for (int i = 0; i <;= dataGridView1.Rows.Count - 1; i++)
{
    if (dataGridView1.Rows[i].Cells[f.cmbColumnCombo.Text].Value.ToString().ToLower().Contains(f.txtfind.Text.ToLower()))
    {
        if (!string.IsNullOrEmpty(f.txtfind.Text))
        {
            
            dataGridView1.Rows[i].Cells[f.cmbColumnCombo.Text].Value = dataGridView1.Rows[i].Cells[f.cmbColumnCombo.Text].Value.ToString().Replace(f.txtfind.Text, f.txtreplace.Text);

            dataGridView1.Rows[i].Cells[f.cmbColumnCombo.Text].Value = dataGridView1.Rows[i].Cells[f.cmbColumnCombo.Text].Value.ToString().Replace(f.txtfind.Text, f.txtreplace.Text);
            bulidDataRow(i);
            
        }                   
    }
}

Below is the code for Browse (at the time selecting the file and reading):

private void button1_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog1 = new OpenFileDialog();

    openFileDialog1.InitialDirectory = "Desktop";
    openFileDialog1.Filter = "dat files (*.DAT)|*.DAT|All files (*.*)|*.*";
    openFileDialog1.FilterIndex = 2;
    openFileDialog1.RestoreDirectory = true;

    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        try
        {
            FileName = openFileDialog1.FileName;
            string text = System.IO.File.ReadAllText(FileName);
            datfile = text.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);

            maxRec = datfile.Length - 1;
            PageCount = maxRec / pageSize;
            LoadPage(MyFOrmat);

Thanks in advance.