want to get color value from a Gradient color bar

Seeing as it's a linear gradient you can calculate the value of the color through some basic mathematical formulas. Something like this (I'm gonna fill in some code here): these four are fields (at the class scope): int rectLeft, rectRight; Color leftColor, rightColor; /*I use the MouseUp event only because it's the last color the user chooses. You could also use the MouseMove event so that the color stays updated.*/ public void Form_MouseUp(object sender, System.MouseEventArgs e) { //make sure the mouse click is in the rectangle if(e.Y > this.gradientRectangle.Y + this.gradientRectangle.Height || e.Y < this.gradientRectangle.Y) return; Color selectedColor; //get how far away the mouse click is from the left side of the rectangle to the right side. double amountChange = (double)(e.X - rectLeft)/(rectRight - rectLeft); //if the mouse click is in the rectangle if(amountChange >= 0 && amountChange <= 1) { //get the new RGB values based on the distance from the left of the rectangle to the right. int nR, nG, nB; nR = (int)(rightColor.R * amountChange + leftColor.R * (1 - amountChange)); nG = (int)(rightColor.G * amountChange + leftColor.G * (1 - amountChange)); nB = (int)(rightColor.B * amountChange + leftColor.B * (1 - amountChange)); selectedColor = Color.fromArgB(nR,nG,nB); } }