回答編集履歴
1
using
answer
CHANGED
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@@ -5,8 +5,7 @@
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5
5
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```C#
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6
6
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private void button1_Click(object sender, EventArgs e)
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7
7
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{
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8
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-
Pen lineSolidPen = new Pen(Color.Black, 10)
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8
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+
using (Pen lineSolidPen = new Pen(Color.Black, 10))
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9
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-
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10
9
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using (Graphics g = Graphics.FromHwnd(this.Handle))
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10
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{
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11
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g.DrawLine(lineSolidPen, 50, 50, 100, 100);
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