combobox Selected Item to be display in DatagridView

Question

Sir, I am doing a ADO.NET Program at the moment.

In my form, there is form named frmTeacher.

I filled its table called tbl_Teacher using frmTeacher form.

there is another form called frmTeacherSearch.

this form is for viewing the data of tbl_teacher(using condition where employeeId=@employeeId)

this form has a combobox and a gridview.

this is my form:-




The purpose of this form:-

combobox:   employeeId  from tbl_Teacher to be filled in it on form_LoadEvent().

You can see i did the code for load the employeeId.

Now my need is to fill datagridview1 with the related data that I select in combobox.

i.e , when I select 1, datagridview1 to be filled the combobox selected index's employeeName,joiningDate and Designation.

please help me in this topic.