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Failed to convert parameter value from a String to a Int32.

Last Modified: 2013-11-08
I have the following code:

 Protected Sub CompleteGridview1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles CompleteGridView1.RowCommand
        Dim currentRowIndex As Integer = Int32.Parse(e.CommandArgument)

        Dim ProductID As String = CompleteGridView1.DataKeys(currentRowIndex).Value
        If Roles.IsUserInRole(Membership.GetUser.UserName.ToString, "ELP_Transport") Then
            Response.Redirect("~/Foxconn/CT/Metrics_Detail_Transport.aspx?Key='" & ProductID & "'")
            Response.Redirect("~/Foxconn/CT/Metrics_Detail.aspx?Key='" & ProductID & "'")
        End If

    End Sub

which calls the Metrics Detail page on page load:

I get the error on the second line:

Dim CT_Key As SqlParameter = cmd.Parameters.Add("@CT_Key", SqlDbType.Int)
CT_Key.Value = Request.QueryString("Key").ToString

rdr = cmd.ExecuteReader() ---> error: Input string was not in a correct format.

Thank you
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