How to Update DataTable object data in C#

DataTable dt = new DataTable();


DataRow[] dr = dt.Select("ItemCode ="+ItemCode);
{
dr[0]["ItemName"] = txtItemName.Text;
dr[0]["ItemName"] = txtItemName.Text;
dr[0]["GroupCode"] = txtGroup.Text;
dr[0]["Price"] = txtPrice.Text;

dr[0]["Descriptions"] = txtDescriptions.Text;

}

read this link
http://stackoverflow.com/questions/1666087/c-sharp-how-to-change-data-in-datatable

it may help you

DataTable dt = new DataTable();
dt.Columns.Add("id", typeof(int));
 dt.Columns.Add("name", typeof(string));
 dt.Rows.Add(1, "lalit");
 dt.Rows.Add(2, "Manoj");
dt.Rows.Add(3, "Mahesh");
 dt.Rows.Add(4, "Priya");



 foreach (DataRow row in dt.Rows)
 {
if (Convert.ToInt32(row["id"]) == 4)
{
row["Name"] = "Priya Yadav";
}
 }