Easy Way to Relate controls C#

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I have a column of 10 textBoxs and another column of 10 labels. I want each Label to be the product between the TextBox at its left and a constant K (when the TextBox is completed).

I was thinking a way to write one function to handle all events of textBoxs Leave, and change the associated label.

Is there an easy way to know which Label to change without comparing the sender with each TextBoxt?

I hope I made myself understood, thanks in advance

Using TableLayoutPanel

Use a TableLayoutPanel, add all the text boxes to the first column and all the labels to the second column. Then handle Validating event of all text boxes using a single event handler.

const int K = 10;
private void TextBoxes_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
    var txt = (TextBox)sender;
    if (int.TryParse(txt.Text, out int value))
    {
        var row = tableLayoutPanel1.GetRow(txt);
        var lbl = tableLayoutPanel1.GetControlFromPosition(1, row);
        lbl.Text = $"{value * K}";
    }
}

You can use TableLayoutPanel methods to find controls based on the position and also find position of a control using GetRow, GetColumn, GetPositionFromControl, GetControlFromPosition.

Using DataGridView

Another option would be using a DataGridView control bound to a DataTable. The DataTable can have an int column and an expression column.

const int K = 10;
private void Form1_Load(object sender, EventArgs e)
{
    var dt = new DataTable();
    dt.Columns.Add("C1", typeof(int));
    dt.Columns.Add("C2", typeof(int), $"C1 * {K}");

    dt.Rows.Add(1);
    dt.Rows.Add(2);
    dt.Rows.Add(3);

    dataGridView1.DataSource = dt;
}

To learn about expression format take a look at DataColumn.Expression.

Develop a Simple Control, In Visual Basic, use the RemoveHandler Statement keyword; in C#, use the -= operator. Use the Remove method to delete the desired control� Looping through the Controls collection is easy. For example, when you click this program’s All button, the following code loops through all of the form’s controls. private void btnAll_Click (object sender, EventArgs e) { lstControls.Items.Clear (); foreach (Control control in Controls) lstControls.Items.Add (control.Name); }

I'd use a couple of arrays and do this:

var labels = new[] { label1, label2, label3, label4, label5, label6, label7, label8, label9, label10, };
var textBoxes = new[] { textBox1, textBox2, textBox3, textBox4, textBox5, textBox6, textBox7, textBox8, textBox9, textBox10, };

for (int i = 0; i < 10; i++)
{
    var textBox = textBoxes[i];
    var label = labels[i];
    textBox.Leave += (_s, _e) => label.Text = (double.Parse(textBox.Text) * 3.14159).ToString();
}

How to: Add to or Remove from a Collection of Controls at Run Time , C# - How to Display another UserControl by Clicking on button in One ICONS Application Duration: 21:55 Posted: 18-Jan-2019 Forces the control to apply layout logic to all its child controls. PerformLayout(Control, String) Forces the control to apply layout logic to all its child controls. PointToClient(Point) Computes the location of the specified screen point into client coordinates. PointToScreen(Point)

Make new object that contained of 1 TextBox and 1 Lable Write all of function and handler in this new object Use this new object in your project instead of standard TextBox and Lable Each of them work separately and do not need to write add any control code to them

C#, I know I can iterate over all controls getting children using a recursive function, but is there something easier or more straightforward, maybe like the following? Dim� If you are dynamically generating controls then obviously you won't be able to have a field for each one. But if you are trying to access the Controls collection for a named control, the ControlCollection can be indexed by name. After adding the text box with the specified name, you can simply do: TextBox txtbx = (TextBox)Controls["txtbx1"];

give all of them a common class. create a javascript handler for it and use $(this) to access the particular textbox on event. to access label you could use .Closest() function.

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LinkLabel In C#, Or a GroupBox is used to categorize the related controls in a group. Design- Time: It is the easiest way to create a GroupBox as shown in the following steps:. C# Passing Parameters to Methods. Suppose if we create a method with parameters in c#, then we need to pass parameters to that method while calling it in our application. In c#, we have different ways to pass parameters to the method, those are

C#, The PaletteGroupView control provides an easy way to serialize a symbol palette to c#; VB.NET. //Imports the Diagram control's namespaces using Syncfusion. HeadEndPoint); //decision is head node //Add a link to the model diagram. Welcome to Windows Controls section of C# Corner. In this section, you will find various Windows Controls related source code samples, articles, tutorials, and tips. Developers: 24 hrs of Non Stop learning, Lightup Virtual Conference

Getting Started with Windows Forms Diagram control, Link Button : It displays text that looks like a hyperlink. Label controls provide an easy way to display text which can be changed from one execution of a page � Add a tag called <pages>. It means all the configuration for the controls will be applicable to all the ASP.Net pages in the solution. The <controls> tag means that you are adding a configuration for the user control. Then we register the user control with the additional tag.

Comments
  • Usually for showing controls in a grid/table layout, it's better to use TableLayoutPanel or DataGridView. If you use DataGridView you can achieve the functionality easily using an expression column. If you use a TableLayoutPanel, you can use GetRow, GetColumn, GetPositionFromControl, GetControlFromPosition to find position of a control or find a control by position.
  • Also it's almost always better to use Validating event to validate TextBox data and get the value.
  • You're welcome!
  • It's a Windows Forms question.