Insert button Code and Mysql data to be save and display in grdiview

I am very new and using visual studio community 2000 and mysql work bench 8.0,

I am having 3 textbox names like textbox1,2,3 and 1 insert button and 1 data gridview for saving data in mysql database, i need code for insert button..

This is mysql coding:

SELECT * FROM testdb.employee;
insert into testDB.employee(employee_id,employee_name,employee_salary) Values ('123','RAFI','10000')
insert into testDB.employee(employee_id,employee_name,employee_salary) Values ('456','RAJESH','20000')
insert into testDB.employee(employee_id,employee_name,employee_salary) Values ('789','RAMESH','30000')
select * from testDB.employee

I don't know how to connecting string and where to write for database connection for mysql workbench 8.0 and visual studio community 2022 pls send me step procedure