How to handle decimal point value?

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C#4.0

I am little bit confuse here, that how to handle decimal point value as i have to receive values like 0.1 , 0.012334839493 , 0.00193999329 , 1 , 2 . when i get this values from database and i have to sent this values upto 4 digits , it is possible with values more than 4 digits but when value less than 4 digit (like 0.1 , 1 , 2 ) comes it gives error. it cannot handle that value , is there any way to handle this situation.


here the code ,

foreach (DataRow row in table.Rows)
{
  string stock = row["stocksum_id"].ToString();
  string product = row["prod_name"].ToString();
  string packing = row["conversion_factor"].ToString();
  string mfg = row["manufacturer_id"].ToString();
  string batch = row["batchno"].ToString();
  string expiry = row["expiry_date"].ToString().Substring(0, 10);
  string mrp = row["mrp"].ToString();
  string totq = row["current_stock"].ToString();
  string[] mrpvalue = row["purchase_price"].ToString().Split('.');
  string barcode = row["scan_code"].ToString();
  string prodGrade = row["prod_grade"].ToString();

  if (totq.Contains("."))
  {
    totq = totq.Substring(0, 3);
  }

when totq receive value 0.1 or 1 it gives error.

Thanks!