How to get value from dataset to one variable? in web application

Question

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What is an error within while loop?

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.Parse(dre["id"].ToString());  //pls give any alternate code within while loop.Error occured in this line.
        int values = (int)dre["id"];
        TextBox1.Text = values.ToString();            
        }      
        con.Close();        
    }

Posted 7-Feb-12 18:48pm

murugeshchinnu

Updated 7-Feb-12 18:58pm

Amir Mahfoozi

v3

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4 solutions

Solution 1

Have A Look At This Article

http://msdn.microsoft.com/en-us/library/haa3afyz(v=vs.90).aspx[^]

Accept This Answer If It Has Helped You

Posted 7-Feb-12 18:53pm

Aniket Yadav

Solution 2

Before executing while loop, you should validate whether you have valid records as:

C#

while (dre.Read())
            {

C#

if (dre.HasRows)
       {
           while (dre.Read())
           {

It is good practice to trace the exception using try..catch block

Posted 7-Feb-12 18:56pm

Ganesan Senthilvel

Comments

Aniket Yadav 8-Feb-12 1:08am

Exactly... This Is The Better Practice Of Coding

Thanks GanesanSenthilvel

Solution 3

Hi Sir,

Yes, as Sen said you must always validate your dr to check if there is a rows or nothing.

And you can try to convert your dr into toString().

Thank You.

Posted 7-Feb-12 19:30pm

SayreCC

Comments

murugeshchinnu 8-Feb-12 3:56am

Thank you.

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ralphlee1 · Accepted Answer · 2012-02-07T19:49:00

Solution 4

SqlCommand.ExecuteScalar()
return the data of first row,first column.

C#

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);        
int values = Convert.ToInt32(cmd.ExecuteScalar());
TextBox1.Text = values .ToString();

Posted 7-Feb-12 19:49pm

ralphlee1

Comments

murugeshchinnu 8-Feb-12 3:56am

Thank you so much

murugeshchinnu 8-Feb-12 4:33am

your coding very helpful for me thanks