Filtering datagridview using multiple controls

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I am using Sqllite database and filtering a datagridview using five comboboxes and its working fine but my problem is when I dont select value in any of the combobox it does'nt work coz I am using AND and if I'll use OR it'll not give me desired result coz I want to filter using all the selected values in the combobox. My code is as follows:

DataView dv = new DataView();
        string voterlist = "select * from voters";
        DataTable dt = Database.myAdapter(voterlist);
        dv = dt.DefaultView;
        dataGridView1.DataSource = dv;
        dv.RowFilter = string.Format("consname= '{0}' AND area = '{1}' AND pollingstn = '{2}' AND wardno = '{3}' AND policestn = '{4}'", combo_consname.SelectedItem, combo_Area.SelectedItem, combo_Polling.SelectedItem, combo_Ward.SelectedItem, combo_Police.SelectedItem);

Posted 20-Apr-13 3:28am

lucky050

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OriginalGriff · Accepted Answer · 2013-04-20T03:56:00

Just be a little more thoughtful about it:

C#

    StringBuilder sb = new StringBuilder();
    bool join = false;
    join = AddFilterData(sb, "cosname", combo_cosname.SelectedItem, join);
    ...
    dv.RowFilter = sb.ToString();
    ...

private bool AddFilterData(StringBuilder sb, string field, object value, bool join)
    {
    if (value != null)
        {
        string s = value.ToString();
        if (!string.IsNullOrEmpty(s))
            {
            if (join)
                {
                sb.Append(" AND ");
                }
            sb.AppendFormat("{0}='{1}' ", field, s);
            join = true;
            }
        }
    return join;
    }