DataTable dt = new DataTable();
dt.Columns.Add("Name");
DataRow dr = dt.NewRow();
dr["Name"] = '"' + "INC0067889" + '"';
dt.Rows.Add(dr);
DataTable dtNew = new DataTable();
dtNew = dt.Clone();
char replace = ' ';
foreach (DataRow d in dt.Rows)
{
DataRow dRow = dtNew.NewRow();
dRow["Name"] = d["Name"].ToString().Replace('"', replace).ToString();
dtNew.Rows.Add(dRow);
}