下面是一段C++程序代码，请高手将它用C#转换一下，主要是指针部分的转化，谢谢

void __fastcall TFormDistr::DrawDistr(TObject *Sender)
{
    try
    {
        b = edit_B->Text.ToDouble();//b = (*edit_B).Text.ToDouble();
        c = edit_C->Text.ToDouble();
        d = edit_D->Text.ToDouble();
    }
    catch(...)
    {
        Application->MessageBox("请重新输入数字！","输入错误",MB_ICONERROR);
        return;
    }    TCanvas *canvas;
    DrawGrid();
    canvas = Image1->Canvas;
    (canvas->Pen)->Style = psSolid; // prepare to Draw gram
    canvas->Pen->Color = clGreen;
    canvas->MoveTo(0,Image1->Height/5);    int i;
    double x,scale,f;
    scale = tb_Scale->Position;
    if ((tb_Scale->Position % 2)==0)
        scale = pow(10,scale/2);
    else
        scale = pow(10,(scale-1)/2) * 5;
    lbScale->Caption = scale;
    
    if(!d)d=1;
    if(!c)c=1;    // 左隶属函数
    if (rb_left->Checked)
    {
        Label_A->Left = Image1->Width * 0.2 ;
        // 逐点绘制
        for(i = 0; i < Image1->Width; i++)
        {
            x = double ( a + scale * double(GRID_COL) * (double(i) / Image1->Width  - 0.2 ) );
            f = FunctionSelector(a, b, c, d, x, FFunctionID);
            f = Image1->Height - f * Image1->Height*(GRID_ROW-1)/GRID_ROW;
            if (i==0)
                canvas->MoveTo(i,f);
            else
                canvas->LineTo(i,f);
        }
    }
    // 右隶属函数
    if (rb_right->Checked)
    {
        Label_A->Left = Image1->Width * 0.8 ;
        // 逐点绘制
        for(i = 0; i < Image1->Width; i++)
        {
            x = double(a + scale * GRID_COL * ( double(i) / Image1->Width - 0.8 ));
            f = FunctionSelector(a, b, c, d, x, FFunctionID);
            f = Image1->Height - f * Image1->Height*(GRID_ROW-1)/GRID_ROW;
            if (i==0)
                canvas->MoveTo(i,f);
            else
                canvas->LineTo(i,f);
        }
    }    // 中间隶属函数
    if (rb_middle->Checked)
    {
        Label_A->Left = Image1->Width * 0.5;
        // 逐点绘制
        for(i = 0; i < Image1->Width; i++)
        {
            x = double(a + scale * double(GRID_COL) * ( double(i) / Image1->Width - 0.5 ));
            f = FunctionSelector(a, b, c, d, x, FFunctionID);
            f = Image1->Height - f * Image1->Height*(GRID_ROW-1)/GRID_ROW;
            if (i==0)
                canvas->MoveTo(i,f);
            else
                canvas->LineTo(i,f);
        }
    }
}