System.Data.SqlClient.SqlException：关键字“ WHERE”附近的语法不正确

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异常详细信息：System.Data.SqlClient.SqlException：关键字“ WHERE”附近的语法不正确。

这是我的代码

Imports System.Data
Imports System.Data.SqlClient

Protected Sub btnEdit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnEdit.Click
    If (IsPostBack) Then
        If (Not Session("Language_ID") = Nothing) Then

            cn.Open()

            Dim cmdEdit As New SqlCommand("UPDATE [tblDefault] SET [Language] = @lang, [Title1] = @title1," & _
                                          "[Details1]=@detail1,[Details2]=@detail2," & _
                                          "[Title3] = @title3, [Details3] = @detail3, [Welcome] = @wel," & _
                                          "WHERE [LangID] = @langid", cn)
            With cmdEdit.Parameters
                .Add("@langid", SqlDbType.BigInt).Value = Val(Session("Language_ID").ToString)
                .Add("@lang", SqlDbType.NVarChar).Value = ddlLang.SelectedValue
                .Add("@title1", SqlDbType.NVarChar).Value = txtTitle1.Text
                .Add("@detail1", SqlDbType.NVarChar).Value = CkeditorDetail1.Text
                .Add("@title2", SqlDbType.NVarChar).Value = txtTitle2.Text
                .Add("@detail2", SqlDbType.NVarChar).Value = CkeditorDetail2.Text
                .Add("@title3", SqlDbType.NVarChar).Value = txtTitle3.Text
                .Add("@detail3", SqlDbType.NVarChar).Value = CkeditorDetail3.Text
                .Add("@wel", SqlDbType.NVarChar).Value = txtWel.Text
            End With

            cmdEdit.Connection = cn
            cmdEdit.ExecuteNonQuery()

            cn.Close()

            Response.Redirect("admin_default.aspx")

        Else
            Response.Redirect("admin_default.aspx")
        End If
    End If
End Sub