C#

<br />
<ComboBox Visibility="visible" Margin="17,25,14,0" x:Name="contact_combobox" VerticalAlignment="Top" Height="24" IsSynchronizedWithCurrentItem="True"><br />
<ComboBoxItem Content="Name"/><br />
<ComboBoxItem Content="Email"/><br />
</ComboBox> 

using System;<br />
using System.Collections.Generic;<br />
using System.ComponentModel;<br />
using System.Data;<br />
using System.Drawing;<br />
using System.Linq;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
using System.Data.OleDb;<br />
using System.Data;<br />
<br />
namespace WindowsFormsApplication1<br />
{<br />
    public partial class Form1 : Form<br />
    {<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.Oledb.4.0;Data Source=E:\\hp\\Source\\Val-Asr-LastPart\\db1.mdb");<br />
            con.Open();<br />
            string sqlstr = "SELECT * FROM kham";<br />
            OleDbCommand com=new OleDbCommand(sqlstr,con);<br />
            OleDbDataAdapter da =new OleDbDataAdapter(com);<br />
            DataSet ds = new DataSet();<br />
            da.Fill(ds, "kham");<br />
            DataRowCollection drc = ds.Tables["kham"].Rows;<br />
            textBox1.Text = (string)drc[0][1];<br />
<br />
<br />
            string str1 = (string)drc[0][1];<br />
            string st="";<br />
            string stt="";<br />
            char[] ch1 = str1.ToCharArray();<br />
            int k=0;<br />
            int i=0;<br />
<br />
<br />
            sqlstr="SELECT * FROM parsed";<br />
            com.CommandText=sqlstr;<br />
            da=null;<br />
            da=new OleDbDataAdapter(com);<br />
            ds=null;<br />
            ds=new DataSet();<br />
            da.Fill(ds,"parsed");<br />
            for (; i < ch1.Length; i++)<br />
            {<br />
                if ((ch1[i] == '1' || ch1[i] == '2' || ch1[i] == '3' || ch1[i] == '4' || ch1[i] == '5' || ch1[i] == '6' || ch1[i] == '7' || ch1[i] == '8' || ch1[i] == '9' || ch1[i] == '0') && (ch1[i + 1] == '?'))<br />
                {<br />
                    for(i++;i<ch1.length;i++)><br />
                        if ((ch1[i]!='(')||(ch1[i+1]!='['))<br />
                            st += ch1[i];<br />
                        else<br />
                        {<br />
                            //ds.Tables["parsed"].Rows[k][1]= st;<br />
                            //st = "";<br />
                            for (i += 6; i < ch1.Length; i++)<br />
                                if ((ch1[i] == '1' || ch1[i] == '2' || ch1[i] == '3' || ch1[i] == '4' || ch1[i] == '5' || ch1[i] == '6' || ch1[i] == '7' || ch1[i] == '8' || ch1[i] == '9' || ch1[i] == '0') && (ch1[i + 1] == '?'))<br />
                                {<br />
                                    //ds.Tables["parsed"].Rows[k++][2] = stt;<br />
                                    string[] sst = { ""+(k++), st, stt };<br />
                                    ds.Tables["parsed"].Rows.Add(sst);<br />
                                    stt = "";<br />
                                    i--;<br />
                                    break;<br />
                                }<br />
                                else<br />
                                    stt += ch1[i];<br />
                            break;<br />
                        }<br />
                }<br />
                    <br />
            }<br />
            da.Update(ds,"parsed");//error refers to here<br />
            }<br />
    }<br />
}<br />
</ch1.length;i++)>