not able to insert data in table using datatable - asp.net

Question

i have one table having 3 rows and i am trying to insert data into first two rows using data table but it is inserting data like this , instead of inserting in first two row it is inserting in other rows
price qty total
--------------------
5 10 -
5 12 -
- - 50
- - 60
but i wants
price qty total
--------------------
5 10 50
5 12 60
i have used following code for selecting data from table than inserting data into table,it is showing data correctly but just inserting in wrong rows
int sp;
public DataTable bind1()
{
SqlConnection con = new SqlConnection("cnnection");
con.Open();
SqlCommand cmd;
cmd = new SqlCommand("select * from [order]", con);
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
con.Close();
return dt;
}
public DataTable bind2()
{
SqlConnection con = new SqlConnection("cnnection");
con.Open();
SqlCommand cmd;
cmd = new SqlCommand("insert into [order](total) values(#total)", con);
cmd.Parameters.AddWithValue("#total", sp);
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
con.Close();
return dt;
}
public void gbind()
{
DataTable dt = new DataTable();
dt = bind1();
DataTable dt1 = new DataTable();
DataColumn dc = new DataColumn("total");
dt1.Columns.Add(dc);
foreach(DataRow drow in dt.Rows)
{
int s1 = Convert.ToInt16(drow["price"]);
int s2 = Convert.ToInt16(drow["qty"]);
int s3 = s1 * s2;
DataRow dr = dt1.NewRow();
dr["total"] = s3;
dt1.Rows.Add(dr);
}
foreach (DataRow row in dt1.Rows)
{
string s1 = row["total"].ToString();
for (int i = 0; i < dt.Rows.Count; i++)
{
sp = Convert.ToInt16(s1);
dt = bind2();
}
}
i have tried like this also but still same problem
public void gbind()
{
DataTable dt = new DataTable();
dt = bind1();
foreach (DataRow drow in dt.Rows)
{
int s1 = Convert.ToInt16(drow["price"]);
int s2 = Convert.ToInt16(drow["qty"]);
int s3 = s1 * s2;
drow["total"] = s3;
sp = s3;
dt = bind2();
}
}

Answer 1

In your forEach loop in the gbind method, I don't think you should be adding a new row for "total", it would need to be a column. And dt1.Rows.Add(dr) should be dt1.Columns.Add(dr). Try rewriting your code to add a column instead. Let me know if that helps any.

Answer 2

Comment these two lines in your code. Remove the code to add extra rows. You just need to update the column value.
foreach(DataRow drow in dt.Rows)
{
int s1 = Convert.ToInt16(drow["price"]);
int s2 = Convert.ToInt16(drow["qty"]);
int s3 = s1 * s2;
//DataRow dr = dt1.NewRow();
dr["total"] = s3;
//dt1.Rows.Add(dr);
}