Question : Gridview Update with One Button Dropdownlist Template

I trying to update my gridview with one button. I wrote some code guiding myself from another forums. It shows no error when i launch the page everything is visible the dropdowlist and after i click the Assign Button the gridview Refresh. Heres the code for the gridview and the button.
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'THIS IS THE CODE FOR THE ASSIGN COMMAND
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Assign1.Click
        For Each gvr As GridViewRow In GridView1.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim strID As String = GridView1.DataKeys(gvr.RowIndex)("ID")
                Dim analistaname As String = CType(gvr.FindControl("Dropdownlist1"), DropDownList).SelectedValue
                ' Call database update method with params
                SqlDataSource1.UpdateParameters("ANALISTA").DefaultValue = analistaname
                SqlDataSource1.Update()
            End If
 
        Next
 
    End Sub
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Answer : Gridview Update with One Button Dropdownlist Template

i used update parameters for controls, and also my dropdowlist needed to be bound to the sqldatasource. I works now. Thanks.
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