Performing query on a table, return value is null

Anyway, I found one suspected issue:

in your code : you are looping over the first matches collection.

 string newcaptureformat = @"\#(?'positionNumber1'\w+)&(?'positionTitle'\w+)&(?'positionDescription'\w+)&(?'companyName'\d+)\s*";
            //matching capture format
            Regex expr1 = new Regex(newcaptureformat);
            MatchCollection matches1 = expr.Matches(sbJobs.ToString());
            foreach (Match match in matches) // ??? looping over the first matches collection.
            {   //inserting value into table
                DataRow newRow = table.Rows.Add();
                newRow["positionNumber1"] = int.Parse(match.Groups["positionNumber1"].Value);
                newRow["positionTitle"] = match.Groups["positionTitle"].Value;
                newRow["positionDescription"] = match.Groups["positionDescription"].Value;
                newRow["companyName"] = match.Groups["companyName"].Value;
            }

Change it to and check if it works.

string newcaptureformat = @"\#(?'positionNumber1'\w+)&(?'positionTitle'\w+)&(?'positionDescription'\w+)&(?'companyName'\d+)\s*";
            //matching capture format
            Regex expr1 = new Regex(newcaptureformat);
            MatchCollection matches1 = expr.Matches(sbJobs.ToString());
            foreach (Match match in matches1)
            {   //inserting value into table
                DataRow newRow = table.Rows.Add();
                newRow["positionNumber1"] = int.Parse(match.Groups["positionNumber1"].Value);
                newRow["positionTitle"] = match.Groups["positionTitle"].Value;
                newRow["positionDescription"] = match.Groups["positionDescription"].Value;
                newRow["companyName"] = match.Groups["companyName"].Value;
            }

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