How to get the details if EmpID already exist

Question

Hi I have employee creation Form and in this form there are Employee ID I want to add new employee but when adding employee id i want to know if employee id already exist so data don't want to save and get the error if employee id already exist. how i can do this please help me.

Dharmraj Thakur · Answer

Just before insert call a method which return all records which is matching in form of DataTable... For example: public DataTable GetEmployee() { //here your select query and store it in DataTable return dataTbl; } //then after inside your page code { DataTable dt = GetEmployee(); if (dt.Rows.Count>0) { //cannot insert and give the warning to user } else { //fire insert query } } Mark accepted if it is helpful to you. Thank you!

Amit Gupta · Answer

Hey You can apply whatever the approach given in my earlier reply. The value given is just an sample you need to change it accordingly. Eg. private void btnInsert_Click (...) { var query = string .Format ( If not exists (select 1 from tablename where employeeId = '{0}' Insert into tableName (empId empName) values ('{0}' '{1}'  txtEmpId.Text txtEmpName.Text) ; if (sqlCommand.ExecuteNonQuery ()>0) MessageBox.Show ( data inserted ); else MessageBox.Show ( Fail to insert data ); }

Yuvi Sharma · Answer

Employee ID will be generated manually It will be a character + number Like : yuvi123 And where the write this coding in a textbox coding or page load coading

Amit Gupta · Answer

First of all if you want to avoid duplicate entry then you can make that employee id as primary key. Second you can query like this If not exists ( select 1 from tablename where employeeId =1) // insert query // when ExecuteQuery ()==0 means no row updated then print whatever you want