CODEWITHSUNDEEP
c#winforms
Khanh Nguyen
Khanh Nguyen

Reputation: 15

Can not change BackColor of Label in Windows Forms once set

First I created this array of LightGray block, and the button START. So the purpose is when I click START the chosen block will turn ForrestGreen:

Each of the LightGray block stored in an Label array called blockLabel. This blockLabel is added by the panel.

enter image description here

here's the code to handle the button:

private void btnStart_Click(object sender,EventArgs e) {
        CreateBlock();
}
private void CreateBlock() {
        blockLabel[5,0].BackColor = Color.ForestGreen;
}

blockLabel code:

blockLabel = new System.Windows.Forms.Label[numCol,numRow];
        // Create many block label
        int i,j;
        for (i = 0; i < numCol; i++) {
            for (j = 0; j < numRow; j++) {
                blockLabel[i,j] = new System.Windows.Forms.Label {
                    Location = new System.Drawing.Point(33*i,33*j),
                    Size = new System.Drawing.Size(30,30),
                    BackColor = Color.LightGray,
                    TabIndex = numCol*i + j
                };
            }
        }
        // World is the panel
        for (i = 0; i < numCol; i++) {
            for (j = 0; j < numRow; j++) {
                World.Controls.Add(blockLabel[i,j]);
            }
        }

The World panel I add by the Designer

When I click Start nothing seems to happen. Any help pls?

Upvotes: 0

Views: 66

Answers (1)

Rufus L
Rufus L

Reputation: 37020

The problem is that your button control is not hooked up to the click event you have defined. You can do this through the designer by selecting the button, then in the Properties window, click the Event icon (lightning bolt), then scroll down to the Click event, and choose your method from the drop down list:

enter image description here

If you're adding the button programmatically, then you can simply add your event hander to the click event like so:

Button btnStart = new Button();
btnStart.Click += btnStart_Click;  // This adds your event hander code to the click event

Controls.Add(btnStart);

Upvotes: 2

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