i have to fetch data from database of specific text box of a web page with help of session concept

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C#

the following code i have given for the name text box of a webpage in that name text box the names which got stored in database at the time of registration has to be fetched and brought out as default in name text box of web page with help of session..help me please..the following code is not working out ..can anyone help me please..soon

My_Util util =new My_Util();
Dataset ds1;
Session["user1"]=textName.Text.ToString();
ds1=util.sendpwdcheck(textName.Text.trim());
if(ds1.Tables[0].Rows.Count>0)
{
Session["user1"]=ds1.Tables[0].Rows[0]["CustName"];
util.SetConnection();
util.sql_con.open();
da=new SqlDataAdapter("select CustName from offsale.OS_forSalelogin where email='"+session["user"]+"',util.sql_con);
da.Fill(ds1);
}