i have a form that contains a text box to accept varchar(50) type data. Please help me add an additional feature to the existing code that prevents the user from entering duplicate entries.
the code i have so far to store user input is:
the code i have so far to store user input is:
Code:
Private Function addInstitute() As Boolean
Dim cmd As New SqlCommand
Dim ok As Boolean = False
cmd.Connection = con
cmd.CommandText = " INSERT INTO institute(institute_name) VALUES(@inn)"
cmd.CommandType = CommandType.Text
cmd.Parameters.AddWithValue("inn", inTxt.Text)
MessageBox.Show("record added")
Try
con.Open()
cmd.ExecuteNonQuery()
ok = True
Catch ex As Exception
MessageBox.Show(ex.Message, "Add failed")
ok = False
End Try
cmd.Dispose()
con.Close()
Return ok
End Function