1. Since it is a background image
So here should be used Button.BackgroudImage = ""; to set the picture
You should not use Button.Image = "";
Because the use BackgroudImage to set the background image, we can also use
BackgroundImageLayout to adjust the picture, so that a better picture displayed on a button
Commonly used:
1 this.btnReset.BackgroundImage = global :: Test.Properties.Resources.btn_reset_out; // set the image path 2 this.btnReset.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch; // set the image display mode, Stretch It represents fill button, button if the picture is not large, it will stretch the picture
2. Then you will see that despite the addition of a background image, and also set up stretching the picture, but the effect is still far from satisfactory
How there will be a border ah, ah how ugly it was, since there is a border, then canceled it borders
However, did not find the button of the Border property, but found FlatStyle property (a property determines the appearance of controls),
Regardless, the first one by one to try anything, and finally Flat feel more in line with our tastes,
Giving the impression that the border is not very thick, but still looks very uncomfortable, how there is a little white box ah
Just could not find the Border property, the original is hidden in the FlatAppearance below, and directly into BorderSize 0
Effect immediately becomes as follows:
Oh, that annoying white box was gone, the overall look and feel comfortable with a lot of ah,
But careful you certainly can see, because the button is rounded background image, actually there on the four corners
That innocent people to leave the white border! ! ! ! , Running the effect is more pronounced, particularly when the mouse moves in and out:
and 
Left mouse is moved before, looks very comfortable; and when the mouse is moved into the right, rub, four corners, that was obvious, obsessive-compulsive disorder, I simply can not accept it!
From the beginning to now toss so long, appeared to get the time, there is still such a small problem ???? do the authors is a Microsoft bug ???
I finally found or wrong, the solution is as follows:
Or in just the FlatAppearance property, but this change is MouseDownBackColor, MouseOverBackColor are set to Transparent (transparent color)
Finally, of course, set about
this.btnReset.BackColor = System.Drawing.Color.Transparent;
Reproduced in: https: //www.cnblogs.com/zhangchenliang/p/4335372.html