ASP.NET

protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        con = new OleDbConnection();<br />
        con.ConnectionString = conString;<br />
        con.Open();<br />
        <br />
        cmdSelect = new OleDbCommand("select * from User_Information", con);<br />
        da = new OleDbDataAdapter("select * from User_Information",con);<br />
        ds = new DataSet();<br />
        da.Fill(ds);<br />
        ArrayPassword = new string[100];<br />
        ArrayNames = new string[100];<br />
        for (i= 0; i < ds.Tables[0].Rows.Count;i++ )<br />
        {<br />
            ArrayNames[i]=(ds.Tables[0].Rows[i].ItemArray[0].ToString());<br />
            ArrayPassword[i]=(ds.Tables[0].Rows[i].ItemArray[1].ToString());<br />
        }<br />
        int j = ArrayNames.Count;<br />
        string arr = ArrayNames;<br />
        //Response.Write(ArrayNames[j - 1].ToString());<br />
 }

function Validate()<br />
{<br />
  for (var i=0;i<document.forms[0].elements.length; i++) <br />
  {	<br />
         var val=document.forms[0].elements[i].value;	<br />
	     if(val=="")<br />
         {<br />
            //alert(document.forms[0].elements[i].name+" can't be left  blank");<br />
            alert("Please Enter the "+document.forms[0].elements[i].name+ " !");<br />
            document.forms[0].elements[i].focus();<br />
            return false;<br />
	    }	<br />
  }<br />
  document.forms[0].action="Default3.aspx";<br />
  var User_name=document.forms[0].elements["Name"].value;<br />
  var User_password=document.forms[0].elements["Password"].value;<br />
  var i=<%=i%>;<br />
  var j; <br />
  var arrayNames=<%=ArrayNames%> ; // ERROR COMES IN THIS LINE....ANY CLUE<br />
  for(j=0;j<i;j++)<br />
  {<br />
        if(User_name==arrayNames[j])<br />
            alert("User Exists");<br />
        else<br />
            alert("User not Exists");<br />
  }<br />
  <br />
  <br />
  // document.forms[0].action="Default3.aspx";<br />
  // return true;<br />
}

Response.Cache.SetExpires(DateTime.Now.AddSeconds(100));<br />
 Response.Cache.SetCacheability(HttpCacheability.Public);

if (UCarticles1.CachePolicy.SupportsCaching)<br />
    {<br />
      UCarticles1.CachePolicy.Duration = new TimeSpan(0,0,20);<br />
    }

Private Sub lblRegister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lblRegister.Click
    Dim myConnection As OdbcConnection
    Dim myCommand As OdbcCommand
    Dim strInsert As String
    Dim strSQL As String
    strSQL = String.Empty

    myConnection = New OdbcConnection("Driver={MySQL ODBC 3.51 Driver};Server=myServer;Database=myDB;User=myUser; Password=myPW;Option=3;")
    strSQL = String.Format("SELECT UserName FROM myTable WHERE (UserName='{0}');", txtUserName.Text)
    myCommand = New OdbcCommand(strSQL, myConnection)
    myCommand.CommandType = CommandType.Text
    myConnection.Open()

    Dim result As Integer = myCommand.ExecuteNonQuery()
    If result > 0 Then
        lblMessage.Text = "That user name is already taken!"
        lblMessage.Text &= "  Please choose another user name."
    Else

        strInsert = "INSERT into myTable (FirstName,LastName,Password,UserName)values (?,?,?,?)"
        Dim myCommand1 As OdbcCommand = New OdbcCommand(strInsert, myConnection)
        myCommand1.CommandType = CommandType.Text
        myCommand1.Parameters.Add("@FirstName", txtFirst.Text)
        myCommand1.Parameters.Add("@LastName", txtLast.Text)
        myCommand1.Parameters.Add("@Password", txtPassword.Text)
        myCommand1.Parameters.Add("@UserName", txtUserName.Text)
        Dim result1 As Integer = myCommand1.ExecuteNonQuery()

        myConnection.Close()

    End If

    txtFirst.Text = ""
    txtLast.Text = ""
    txtUserName.Text = ""
    txtPassword.Text = ""
End Sub