C# WinForms透明图片框不工作

我一直在尝试在背景上放置一个黑色/灰色的图像，我希望在图像的透明部分显示背景。图像绝对正确地保存为透明png。下面的代码有什么问题

this.pictureBox14.BackColor = System.Drawing.Color.Transparent;
this.pictureBox14.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("pictureBox14.BackgroundImage")));
this.pictureBox14.BackgroundImageLayout = System.Windows.Forms.ImageLayout.None;
this.pictureBox14.Cursor = System.Windows.Forms.Cursors.Hand;
this.pictureBox14.Location = new System.Drawing.Point(486, 337);
this.pictureBox14.Name = "pictureBox14";
this.pictureBox14.Size = new System.Drawing.Size(69, 62);
this.pictureBox14.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
this.pictureBox14.TabIndex = 18;
this.pictureBox14.TabStop = false;
this.pictureBox14.Click += new System.EventHandler(this.pictureBox14_Click);

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图像上需要透明的颜色是什么？在运行时发布一张照片？我发现解决方案是这样做。pictureBox.parent=this.parentPictureBox如果要对范围3-25中的所有图片框执行此操作，这里有一个方便的python脚本：（[print（“this.pictureBox”+str（x）+“。parent=this.pictureBox；”。对于范围（3,25）中的x）@SwimBikeRun请发布您自己的解决方案作为答案，并将其标记为已接受