Updating database that contain Picture

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C#

SQL-Server

WPF

Hi everyone,

Updating database, make this error: Failed to convert parameter value from a Image to a Byte[].
how can i recorrect it?

thanks,

private void btnUpdate_Click(object sender, RoutedEventArgs e)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=E:\Data\WPF\Personel.mdf;Integrated Security=True;User Instance=True";

            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;

            SqlDataAdapter da = new SqlDataAdapter();
            da.UpdateCommand = new SqlCommand(@"Update Personnels Set Name = @Name, Family = @Family, Picture = @Picture Where No = @No", con);

            da.UpdateCommand.Parameters.Add("@No", SqlDbType.Int).Value = txtNo.Text.ToString();
            da.UpdateCommand.Parameters.Add("@Name", SqlDbType.NVarChar).Value = txtName.Text;
            da.UpdateCommand.Parameters.Add("@Family", SqlDbType.NVarChar).Value = txtFamily.Text;
            da.UpdateCommand.Parameters.Add("@Picture", SqlDbType.VarBinary).Value = Picture;

            con.Open();
            da.UpdateCommand.ExecuteNonQuery();

            con.Close();
            this.ShowData();
        }

<Image  Grid.Column="6" Margin="35,6,0,0" Grid.RowSpan="9" Name="Picture" DataContext="{Binding Path=SelectedItem, ElementName=grdPersonnel1}" HorizontalAlignment="Left" Width="213"></Image>


<DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Path=No}" Header="No" Width="Auto"></DataGridTextColumn>
        <DataGridTextColumn Binding="{Binding Path=Name}" Header="Name" Width="Auto"></DataGridTextColumn>
        <DataGridTextColumn Binding="{Binding Path=Family}" Header="Family" Width="Auto"></DataGridTextColumn>
        <DataGridTemplateColumn Header="Picture" Width="40" >
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Image Source="{Binding Path=Picture}" Margin="1" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>