Thread: "Existing record" alert

Hi, i want to know what code to put to pop a message box saying that a record already exist in the database?

i'm just new to Visual Basic.. i'm using 2008 version by the way and here are the codes that i made

Private Sub cmdinsert_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdinsert.Click
strsql = "insert into client(Name, Address, Bday, Age, City, telnum) values (@field2, @field3, @field4, @field5, @field6, @field7)"
objcmd = New MySql.Data.MySqlClient.MySqlCommand(strs… objconn)
With objcmd
.Parameters.AddWithValue("@field2", txtname.Text)
.Parameters.AddWithValue("@field3", txtaddr.Text)
.Parameters.AddWithValue("@field4", txtbday.Text)
.Parameters.AddWithValue("@field5", txtage.Text)
.Parameters.AddWithValue("@field6", txtcity.Text)
.Parameters.AddWithValue("@field7", txtcontact.Text)
End With
objcmd.ExecuteNonQuery()
objcmd.Dispose()
MsgBox("Client Registered!")

here is for updating a record

Private Sub cmdupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdupdate.Click

strsql = "update client set Name=@field2, Address=@field3, Bday=@field4, Age=@field5, City=@field6, telnum=@field7 where cID=@field1"
objcmd = New MySql.Data.MySqlClient.MySqlCommand(strs… objconn)
With objcmd
.Parameters.AddWithValue("@field1", txtid.Text)
.Parameters.AddWithValue("@field2", txtname.Text)
.Parameters.AddWithValue("@field3", txtaddr.Text)
.Parameters.AddWithValue("@field4", txtbday.Text)
.Parameters.AddWithValue("@field5", txtage.Text)
.Parameters.AddWithValue("@field6", txtcity.Text)
.Parameters.AddWithValue("@field7", txtcontact.Text)
End With

objcmd.ExecuteNonQuery()
objcmd.Dispose()
MsgBox("Info Updated!")

I want to know what to put in so that every time i enter a new record that matches the same information from the existing one, instead of adding a new row, i can just alert it with a message box saying that "record already exist"..

i'm using mysql 5.1 database

Query the database first and get a count of the records that match. If that count is not zero then your record is a duplicate.