c# select from table some columns

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I need to select 2 columns from 2comboboxes from table1 and put the data in these 2 columns in in listview11 in button1 click event

C++

if (cn.State == ConnectionState.Closed) cn.Open();
            cm.Connection = cn;
            if (comboBox3.Enabled == true)
            {
                string searchFor2 = comboBox1.Text;
                string searchFor3 = comboBox2.Text;
                string selectSql = "SELECT " + searchFor2 + ", " + searchFor3 + " FROM itmsparts";
                SqlCommand com = new SqlCommand(selectSql, cn);
                try
                {
                    using (SqlDataReader read1 = com.ExecuteReader())
                    {
                        while (read1.Read())
                        {
                            foreach (ListViewItem item in listView1.Items)
                            {
                                item.Text = (read1["searchFor2"].ToString());
                                item.SubItems[1].Text = (read1["searchFor3"].ToString());

                            }


                        }
                    }
                }
                finally
                {

                }
            }

but no error and no nothing is added to listview1

Posted 10-Nov-15 7:25am

Ahmed Zoeil

Updated 10-Nov-15 8:03am

v3

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OriginalGriff · Accepted Answer · 2015-11-10T08:11:00

Well, I'd start with the debugger.
Put a breakpoint on the line

csb

while (read1.Read())

and look at exactly what is in the selectSql string.
Then, single step you code and see exactly what is happening.

My guess is that either the foreach loop doesn't execute because your listview is empty, or you are getting exceptions because there are no results returned that have the column names "searchFor2" and "searchFor3". It's possible that this would fix that:

C#

{
    item.Text = (read1[searchFor2].ToString());
    item.SubItems[1].Text = (read1[searchFor3].ToString());

But you need to start by finding out exactly what is happening first.