Explanation:

We will make an account on creating an HTML Table from a DataTable. This can be very usefull in some cases when a small Data is need be displayed.

public static string ConvertToHtmlFile(DataTable sentDataTable)
{
 
    // Check if the Sent DataTable is not empty or a Null
    if (sentDataTable == null)
    {
        throw new System.ArgumentNullException("sentDataTable");
     }

 //Get a worker object.
 StringBuilder myStringBuilder = new StringBuilder();

 //Open tags and write the top portion.
 myStringBuilder.Append("");
 myStringBuilder.Append("");
 myStringBuilder.Append("");
 myStringBuilder.Append("");
 myStringBuilder.Append("");
 myStringBuilder.Append("

 //Add the headings row.

 myStringBuilder.Append("

 foreach (DataColumn myColumn in sentDataTable.Columns)
 {
  myStringBuilder.Append("

 myStringBuilder.Append("

 //Add the data rows.
 foreach (DataRow myRow in sentDataTable.Rows)
 {
  myStringBuilder.Append("

  foreach (DataColumn myColumn in sentDataTable.Columns)
  {
   myStringBuilder.Append("

  myStringBuilder.Append("

 //Close tags.
 myStringBuilder.Append("

    return myStringBuilder.ToString();
}