GridView reloads all Record after Row Selection - asp.net

Question

At Page Load, I populate the GridView with records. Then I created a search functionality to search for records. The GridView is actually updating based on the search text. The problem is when I select a row, the GridView shows all the records and not the list based on search.
Here is the code:
Imports MySql.Data.MySqlClient
Public Class Main_Admin
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim myConnection As MySqlConnection
Dim myDataAdapter As MySqlDataAdapter
Dim myDataSet As DataSet
Dim strSQL As String
'Dim iRecordCount As Integer
myConnection = New MySqlConnection("server=localhost; user id=root; password=admin; database=db; pooling=false;")
strSQL = "SELECT emp_id AS 'Employee ID', emp_sname AS Surname, emp_fname AS 'First Name', emp_mname AS 'Middle Name', tbl_emp_cat.cat_name AS 'Category', nature AS 'Nature of Employment' FROM tbl_employee JOIN tbl_emp_cat ON tbl_employee.emp_cat = tbl_emp_cat.emp_cat;"
myDataAdapter = New MySqlDataAdapter(strSQL, myConnection)
myDataSet = New DataSet()
myDataAdapter.Fill(myDataSet, "mytable")
GridView1.DataSource = myDataSet
GridView1.DataBind()
myConnection.Close()
End Sub
Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GridView1.RowDataBound
e.Row.Cells(0).Width = 100
e.Row.Cells(0).Attributes.CssStyle("text-align") = "center"
e.Row.Cells(1).Width = 100
e.Row.Cells(2).Width = 100
e.Row.Cells(3).Width = 100
e.Row.Cells(4).Width = 100
If (e.Row.RowType = DataControlRowType.DataRow) Then
'e.Row.Attributes("onmouseover") = "this.style.cursor='hand';"
e.Row.Attributes("onmouseout") = "this.style.textDecoration='none';"
e.Row.Attributes("onclick") = ClientScript.GetPostBackClientHyperlink(Me.GridView1, "Select$" & Convert.ToString(e.Row.RowIndex))
e.Row.Attributes.Add("onmouseover", "this.style.cursor='hand';this.style.textDecoration='underline';")
'e.Row.Attributes.Add("onmouseout", "this.style.textDecoration='none';")
'e.Row.Attributes.Add("onclick", ClientScript.GetPostBackClientHyperlink(Me.GridView1, Page.ClientScript.GetPostBackEventReference(GridView1, e.Row.RowIndex)))
' "Select$" + e.Row.RowIndex.ToString())
End If
End Sub
Protected Sub GridView1_PageIndexChanging(sender As Object, e As GridViewPageEventArgs)
GridView1.SelectedIndex = -1
End Sub
Private Sub search_Click(sender As Object, e As EventArgs) Handles search.Click
Dim myConnection As MySqlConnection
Dim myDataAdapter As MySqlDataAdapter
Dim myDataSet As DataSet
Dim strSQL As String
'Dim iRecordCount As Integer
myConnection = New MySqlConnection("server=localhost; user id=root; password=admin; database=db; pooling=false;")
strSQL = "SELECT emp_id AS 'Employee ID', emp_sname AS Surname, emp_fname AS 'First Name', emp_mname AS 'Middle Name', tbl_emp_cat.cat_name AS 'Category', nature AS 'Nature of Employment' FROM tbl_employee JOIN tbl_emp_cat ON tbl_employee.emp_cat = tbl_emp_cat.emp_cat WHERE emp_sname LIKE '%" & search_text.Text + "%';"
myDataAdapter = New MySqlDataAdapter(strSQL, myConnection)
myDataSet = New DataSet()
myDataAdapter.Fill(myDataSet, "mytable")
GridView1.DataSource = myDataSet
GridView1.DataBind()
myConnection.Close()
End Sub
End Class

Answer 1

A quick glance at your code shows that you are missing this line in you page load
If Not Page.IsPostBack Then
->put your code here
End if
Your grid view is being refreshed each time on page load wiping off your filtering functionality.Hope this helps.