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Case 1:

myString =Regex.Replace(myString,"/kg","",RegexOptions.IgnoreCase);

Case 2: If you're going to do this a lot of times, you could do:

// You can reuse this object
Regex regex =newRegex("/kg",RegexOptions.IgnoreCase);
myString = regex.Replace(myString,"");

Column names

If a column name contains any of these special characters ~ ( ) # \ / = > < + - * % & | ^ ' " [ ], you must enclose the column name within square brackets [ ]. If a column name contains right bracket ] or backslash \, escape it with backslash (\] or \\).

http://www.csharp-examples.net/dataview-rowfilter/

List<string> lstSCol = new List<string>();
foreach (string sSC in sOutputColumn.Split(','))
    if (dtResult.Columns.Contains(sSC))
        lstSCol.Add(sSC);


for (int iS = 0; iS < lstSCol.Count; iS++)
    dtResult.Columns[lstSCol[iS]].SetOrdinal(iS);

        private DataTable ConvertToTable(string sVal)
        {
            DataTable dt = new DataTable();

            if (sVal.Length > 0)
            {
                string[] asVal = sVal.Replace(Environment.NewLine, "\n").Split('\n');

                foreach (string sVC in asVal[0].Split(','))
                    dt.Columns.Add(sVC);

                for (int i = 1; i < asVal.Length; i++)
                {
                    string[] asVV = asVal[i].Split(',');
                    object[] aobj = new object[asVV.Length];

                    for (int j = 0; j < asVV.Length; j++)
                        aobj[j] = asVV[j];

                    dt.LoadDataRow(aobj, true);
                }
            }

            return dt;
        }

        private string ReadTextFileFromResource(string sFile)
        {
            string sRet = "";

            try
            {
                Assembly assembly = Assembly.GetCallingAssembly();

                StreamReader textStreamReader = new StreamReader(assembly.GetManifestResourceStream(<File name with full namespce>));

                sRet = textStreamReader.ReadToEnd();

                textStreamReader.Close();
            }
            catch (Exception err)
            {
                MessageBox.Show(this, err.Message, "Error");
            }

            return sRet;
        }