Error converting data type varchar to float.แบบนี้ หมายความว่าไงคะ จะต้องแก้ยังไงหรอ ??

Dim cmd As New SqlCommand(str, cnn)

        '  If MessageBox.Show("คุณต้องการบันทึกข้อมูลใช่หรือไม่?", "ยืนยัน", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.Yes Then

        For i As Integer = 0 To DataGridView1.RowCount - 1
            With cmd
                .CommandType = CommandType.StoredProcedure
                .CommandText = "pMem"
                .Parameters.AddWithValue("@dates", DateTimePicker1.Value.AddYears(-543).ToString("yyyy-MM-dd"))
                .Parameters.AddWithValue("@times", SqlDbType.VarChar).Value = ComboBox1.Text
                .Parameters.AddWithValue("@Id", DataGridView1.Rows(i).Cells(0).Value)
                .Parameters.AddWithValue("@point", DataGridView1.Rows(i).Cells(1).Value)
                .Parameters.AddWithValue("@position", DataGridView1.Rows(i).Cells(2).Value)
                .Parameters.AddWithValue("@pf", SqlDbType.Float).Value = TextBox1.Text
                .Parameters.AddWithValue("@W", SqlDbType.Float).Value = TextBox2.Text
                .Parameters.AddWithValue("@Reponsible", SqlDbType.VarChar).Value = TextBox5.Text

            End With
            cmd.Connection = cnn
            cmd.ExecuteNonQuery()
            ' cmd.Parameters.Clear()
        Next

        MessageBox.Show("บันทึกข้อมูลเรียบร้อยแล้ว", "ข้อความ", MessageBoxButtons.OK, MessageBoxIcon.None)