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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uspatel · Answer 1 · 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());

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.

Aniket Yadav · Answer 3 · 2012-02-07T01:57:00

Solution 3

Try This

C#

int values = dre.GetInt32(id);

Posted 7-Feb-12 1:57am

Aniket Yadav