How to get value from dataset to one variable?

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Please what is an error within while loop? c#.net web application program.

C#

protected void Page_Load(object sender, EventArgs e)
    {
        string path = "Data Source=192.168.1.14;Initial Catalog=nazer;User ID=sa;Password=admin*123";
        SqlConnection con = new SqlConnection(path);
        con.Open();
        string query = "select MAX(id) from tbl_samp1";
        SqlCommand cmd = new SqlCommand(query, con);        
        SqlDataReader dre=cmd.ExecuteReader();
        while (dre.Read())
        {            
            int values = (int)dre["id"];          //what error in this line? please...
        TextBox1.Text = values.ToString();
            
        }
        con.Close();
        
    }

Posted 7-Feb-12 1:47am

murugeshchinnu

Updated 7-Feb-12 2:06am

v3

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Uday P.Singh 7-Feb-12 7:58am

what is the error message?

3 solutions

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Aniket Yadav · Answer 1 · 2012-02-07T01:57:00

Solution 3

Try This

C#

int values = dre.GetInt32(id);

Posted 7-Feb-12 1:57am

Aniket Yadav

Costica U · Answer 2 · 2012-02-07T01:57:00

Solution 2

1. The result of the query may be NULL when no rows in the table
2.

C#

dre["id"]

- the query does not have column name "id"
change to

SQL

select MAX(id) as id from tbl_samp1

Posted 7-Feb-12 1:57am

Costica U

Comments

murugeshchinnu 7-Feb-12 8:04am

sorry that table having id,name and etc.. fields with records

Costica U 7-Feb-12 8:33am

Yes, the table has the column name "id" but the query uses max(id) with no column name for the result. Look at the changed query within my solution.

uspatel · Answer 3 · 2012-02-07T01:50:00

Solution 1

USe

C#

int values = int.Parse(dre["id"].ToString());

Posted 7-Feb-12 1:50am

uspatel

Comments

murugeshchinnu 7-Feb-12 7:59am

Thanks Uma, but this line also have an error(Index bound of exception)

uspatel 7-Feb-12 23:55pm

string query = "select MAX(id) as maxid from tbl_samp1";
and use
int values = int.Parse(dre["maxid"].ToString());