Format cell as text in CSV

See more:

C#3.5

ASP.NET4

i am working with a .txt file data with 100+ columns and rows transferring into .csv format file and everything is working fine. but problem is , i am getting some exponential values e.g. 48123E+1 because those are larger in size which i don't want , so is there any way to format cell as text to avoiding these values and get the values in the form of simple number 004812334242424. Below is my code snipet but no success . please help.

thanks in Advance.

e.g. i have column1,column2,column3,column4.... etc

and only column3,column5,column100 needs to be format as text only ... it would be slightly great for me .

What I have tried:

var result = new StringBuilder();
            StreamWriter objWriter = new StreamWriter(destPath, false);
            int cnt = 0;
            foreach (DataColumn dc in dt.Columns)
            {
                result.Append(dc.ColumnName);
                result.Append(cnt == dt.Columns.Count - 1 ? Environment.NewLine : ",");
                cnt = cnt + 1;
            }

            foreach (DataRow row in dt.Rows)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    result.AppendFormat("=TEXT(C1," + row[i] + "),");
                    result.Append(row[i].ToString().Replace("\n", ""));
                    result.Append(i == dt.Columns.Count - 1 ? "\n" : ",");
                    
                }
                //result.Append();
            }
            objWriter.WriteLine(result.ToString());
            objWriter.Close();