how to hide blank email id in Checklistbox

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I have created one email sender, in that all email ids come from database listed into checkedlistbox, i have problem that if email id not enter into database then its showing me blank checkbox

for exmaple
1 sample@gamil.com
2
3 mudas3213@gmail.com
4 priyadas256@yahoo.in

i want to hide the blank email id i.e: "2" one i don't want to show in checklistbox
if any possibility to do this.
so how to solve this problem ?
please help me

Posted 5-Jun-12 8:05am

Durgesh Chauhan

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db7uk · Answer 1 · 2012-06-05T08:25:00

There are several ways to do this.

Using SQL
If you are using SQL in your database for example could you not do a

SQL

select * from emails where (not (email is null))

Using Dataset
If you are binding directly to a datatable (from a dataset) set then you could use a dataview or linq expression.

Linq

C#

// Fill the DataSet.
DataSet ds = new DataSet();
ds.Locale = CultureInfo.InvariantCulture;
FillDataSet(ds);

DataTable emails= ds.Tables["Emails"];

var query =
    from email in emails.AsEnumerable()
    where order.Field<string>("EmailAddress") != ""
    select new
    {
        EmailAddress = order.Field<string>("EmailAddress")
    };

chkBoxList.DataSource = query.ToList;
chkBoxList.DataBind();

DataView

C#

DataView emailsView = new DataView(emailsDS.Tables["Emails"],
                                 "EmailAddress <> ''",
                                 "EmailAddress",
                                 DataViewRowState.CurrentRows);
chkBoxList.DataSource = emailsView;
chkBoxList.DataBind();

taha bahraminezhad Jooneghani · Answer 2 · 2012-06-05T08:39:00

Solution 2

checking null is not a good idea because empty is different than null!
linq:
var a = (from a in ctx.emails Where a.email.Length!=0 select a).ToList();

Posted 5-Jun-12 8:39am

taha bahraminezhad Jooneghani

Durgesh Chauhan · Answer 3 · 2012-06-06T02:42:00

This is the code to retrieve data from database into Checkedlistbox

C#

string connString = "Data Source=DURGESH-PC;Initial Catalog=SCF;Persist Security Info=True;User ID=sa;Password=durgesh";
                string sql = "select email from studentdetails where (not (email is null))";
                SqlConnection conn = new SqlConnection(connString);
                SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                DataTable dt = new DataTable();
                da.Fill(dt);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    string data1 = dt.Rows[i]["email"].ToString();
                    checkedListBox1.Items.Add(data1);
                }

Durgesh Chauhan · Answer 4 · 2012-06-06T03:18:00

Solution 4

change the sql select statement

SQL

select email from studentdetails where email !=''

Posted 6-Jun-12 3:18am