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Validate student id,username if already exist in database table . Using VB.Net 2012 and SQL database on windows10 system. Thanks for your help.this is my first post so thank you for your help guys. Private Sub InsertSutdent() SQL.AddParam("@stud_name", txtFirstname.Text) SQL.AddParam("@stud_lastname", txtlastname.Text) SQL.AddParam("@stud_id", txtStudentId.Text) SQL.AddParam("@stud_username", txtUsername.Text) SQL.AddParam("@stud_course", cbxCourse.Text) SQL.AddParam("@stud_password", txtpassword.Text) SQL.AddParam("@active", … |