Select data from table1 and copy it to table2

Question

I am a real novice in c#.

I have seen many questions like this over here. But, on trying, I could not get my code.

I want all the columns of a row to be retrieved and then transfer it to another table of same database.

So basically, retrieve data from table1 and copy it to the respective columns of table2 .

I have tried this much code. And I am confused as how to call directly check string instead of defining each column in str1 string in the " ".

 string check = "select * from custdetails where billid = @billid ";

         SqlCommand cmd1 = new SqlCommand(check , conn);
        cmd1.Parameters.AddWithValue("@billid", billid);

        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter(cmd1);
        da.Fill(ds);
       // string str1;
        int count = ds.Tables[0].Rows.Count;
        if (count > 0)
        {
            string str1 = ds.Tables[0].Rows[0][""].ToString();
        }

I really dont have much idea about c#. Thanks for help.

Answer 1

You can do so by using :

INSERT INTO table2 (SELECT * FROM  table1 WHERE billid = @billid)

the above is gud only when table1 & table2 had same structure. In case both table has different structure you need to change SELECT * to SELECT [COLUMNS ,]...

One you are done Copying the Data then you can carry on with reading data into you application

string check = "select * from custdetails where billid = @billid ";

SqlCommand cmd1 = new SqlCommand();
// use the command object to copy table first....
cmd1.Connection = conn;
cmd1.CommandText = "INSERT INTO table2 (SELECT * FROM  table1 WHERE billid = @billid)";
cmd1.ExecuteNonQuery();

//then continue doing the normal work
cmd1.CommandText = check;
cmd1.Parameters.AddWithValue("@billid", billid);

DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd1);
da.Fill(ds);
// string str1;
int count = ds.Tables[0].Rows.Count;
if (count > 0)
{
    string str1 = ds.Tables[0].Rows[0][""].ToString();
}

Answer 2

You can achieve it by the following line.

INSERT INTO targettable
SELECT * FROM custdetails WHERE billid = @billid;