Show Progress Bar While Loading Data in Windows Forms using C#

Hi!

I want use progressbar till finishing adding question.

My code in below.

ofd.Filter = "All files(*.doc,*.rtf,*.docx)|*.doc;*.rtf;*.docx";
if (ofd.ShowDialog() != DialogResult.OK)
{
     MessageBox.Show("File not choose");
}
else
{
     object filename = ofd.FileName;
     Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();
     Microsoft.Office.Interop.Word.Document doc = new Microsoft.Office.Interop.Word.Document();
     object readOnly = false;
     object isVisible = true;
     object missing = System.Reflection.Missing.Value;
     doc = app.Documents.Open(ref filename, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref isVisible);
     List<string> data = new List<string>();
     for (int i = 0; i < doc.Paragraphs.Count; i++)
     {
         string temp = doc.Paragraphs[i + 1].Range.Text.Trim();
         if (temp != string.Empty)
             data.Add(temp);
     }                
     DataTable dt = new DataTable();
     dt.Columns.AddRange(new DataColumn[] { new DataColumn("question"), new DataColumn("clas") });
     DataRow dr = dt.NewRow();
     for (int i = 0; i < data.Count; i++)
     {
         dr[0] = data[i].Replace("@", "");
         dt.Rows.Add(dr);
         dr = dt.NewRow();
         // I want use here
         int min = 1;
         proBar.Value = min;
     }
     Grid.Columns["question"].Width = 520;
     Grid.Columns["question"].HeaderText = "Саволҳо";
     Grid.Columns["question"].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
     Grid.Columns["clas"].Width = 50;
     Grid.Columns["clas"].HeaderText = "Синф";
     Grid.Columns["clas"].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
     Grid.DataSource = dt;
     doc.Close(ref missing, ref missing, ref missing);
}