select sum query by sql in C#

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i want to sum all values in column "GlassesPrice" and show it in message box.

double income = 0;
            DataTable dt = new DataTable();
            string date = toolStripComboBox3.Text +"/"+ toolStripComboBox2.Text +"/"+ toolStripComboBox1.Text;
            string strconn = @"Data Source=C:\DB\opticsinfo.sdf";
            SqlCeConnection conn = new SqlCeConnection(strconn);
            conn.Open();
            SqlCeCommand cmd = new SqlCeCommand("select SUM(GlassesPrice) as income from EyeGlasses where CheckinDate=" + date + ";", conn);
            SqlCeDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                income = Convert.ToDouble(dr[0]);
            }
            conn.Close();
            MessageBox.Show(income.ToString());

C#

but i have exception in the underline line
"

Data conversion failed. [ OLE DB status value (if known) = 2 ]

"
what is the problem??

Posted 5-Dec-13 6:44am

Member 9557321

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keerth516 · Accepted Answer · 2013-12-05T06:52:00

Solution 1

can you please check the sqlquery ,whether you are able to get the data based on above query in sqlserver

If query is correct can you change the query as below and run and see what result you are getting

C#

SqlCeCommand cmd = new SqlCeCommand("select SUM(GlassesPrice) as income from EyeGlasses where CheckinDate='" + date +"'", conn);

If you have any issue ...please ask

Posted 5-Dec-13 6:52am

keerth516

Comments

Member 9557321 5-Dec-13 13:15pm

Thanx bro there is single colon missed
5 hours trying to solve it, although it is not first time to do it.
thanks again :)

keerth516 7-Dec-13 22:51pm

your welcome ...keep smiling

Member 14058289 21-Sep-19 23:09pm

how to sum two table field and show dataGridView one
columns with out inner join