C#

Actually sir the thing is that event will also be called when code exit out of backup....so i think thats not an issue....The main thing is, the line 

Process process=Process.Start(psi);

is not executing....and after this line i m getting error.....

try
        {
            
            //OleDbCommand oleDbCmd = new OleDbCommand("Select * From [Sheet1]", oleDbCon);            
            //oleDbDa.SelectCommand = oleDbCmd;            
            oleDbDa.Fill(ds,"ServerName");
            DataTable dt = ds.Tables["ServerName"];
            //string str1stValue = ds.Tables[0].Rows[0][0].ToString();
            foreach(DataRow dr in dt.Rows)
            {
                foreach (DataColumn dc in dt.Columns)
                    strServerName.Append(dr[dc].ToString()).Append("\",\"");
                    //strServerName.AppendFormat("\",\"", dr[dc].ToString());
            }
           //strFinalList = strFinalList.AppendFormat("\",\"", strServerName);
            Response.Write(strServerName);
        }

foreach(DataRow dr in dt.Rows)
{
  foreach (DataColumn dc in dt.Columns)
    strServerName.AppendFormat( "\"{0}\"," , dr[dc] );
}
strServerName.Length-- ;

Arun Philip Reynolds wrote:

It is just like the SQL statement that we write.
e.g. Select * from table
where name like ('abc','def','ghi')

strHolderString = strServerName.ToString();
                strHolderString = strHolderString.TrimEnd(',');
                strFinalList = new StringBuilder(strHolderString);

string result="";
string sep="";
foreach(string s in strings) {
    result+=sep+"\""+s+"\"";
    sep=",";
}