Find and Update cell in DataTable

DataTable dt = new DataTable();

// Get all DataRows where the name is the name you want.
IEnumerable<datarow> rows = dt.Rows.Cast<DataRow>().Where(r => r["Name"].ToString() == "SomeName");
// Loop through the rows and change the name.
rows.ToList().ForEach(r => r.SetField("Name", "AnotherName"));

// Alternative approach.
// Simply loop through the rows, check the value of the Name field and change its value accordingly.
foreach (DataRow row in dt.Rows)
{
	if (row["Name"].ToString() == "SomeName")
		row.SetField("Name", "AnotherName");
}

Table.AsEnumerable().Where(s=>Convert.ToString(s["Name"]).Equals("valuetocheck")).ToList().ForEach(D=>D.SetField("Age",AgevalueToUpdate));