The steps to create an application with Expression Editor control are as follows:

• Step 1: Add Expression Editor components to application
• Step 2: Bind the components
• Step 3: Add Result panel
• Step 4: Subscribe to and handle the ExpressionChanged event
• Step 5: Build and Run the Project

The following image exhibits Expression Editor control.

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Step 1: Add Expression Editor components to application

1. Create a Windows Forms application, and open Form1.cs.
2. Add C1ExpressionEditor and C1ExpressionEditorPanel components to your form.

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Step 2: Bind the components

Bind the C1ExpressionEditor and C1ExpressionEditorPanel components using ExpressionEditor property exposed by C1ExpressionEditorPanel class, as shown in the following code snippet.

InitializeComponent();
c1ExpressionEditorPanel1.ExpressionEditor = c1ExpressionEditor1;

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Step 3: Add Result panel

1. To create result panel, add a label and a text box control.
2. Set the text property of label to Result:, and name the text box txtResult.

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Step 4: Subscribe to and handle the ExpressionChanged event

Subscribe to the ExpressionChanged event of C1ExpressionEditor, and handle the ExpressionChanged event to show result of the entered expressions, as shown in the following code snippet.

    //...
    c1ExpressionEditor1.ExpressionChanged += c1ExpressionEditor1_ExpressionChanged;
}
private void c1ExpressionEditor1_ExpressionChanged(object sender, EventArgs e)
{
    if (!c1ExpressionEditor1.IsValid)
    {
        txtResult.Text = "";
    }
    else
    {
        txtResult.Text = c1ExpressionEditor1.Evaluate()?.ToString();
    }
}

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Step 5: Build and Run the Project

1. Click Build | Build Solution to build the project.
2. Press F5 to run the project.

You have successfully created a Windows forms application with Expression Editor control. Enter a valid expression and see the results.

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1. Initialize ExpressionEditor object.

   C#	Copy Code
   C1ExpressionEditor c1ExpressionEditor1;

2. Initialize a custom DataItem class for data source.

   C#	Copy Code
   DataItem dt = new DataItem();

3. Add the ExpressionEditor and ExpressionEditorPanel controls to the form.

   C#

   Copy Code

   // Initialize Expression Editor class c1ExpressionEditor1 = new C1.Win.ExpressionEditor.C1ExpressionEditor(); // Add Expression Editor to the form this.Controls.Add(c1ExpressionEditor1); // Initialize Expression Editor Panel class C1ExpressionEditorPanel c1ExpressionEditorPanel1 = new C1.Win.ExpressionEditor.C1ExpressionEditorPanel(); // Add Expression Editor Panel to the form this.Controls.Add(c1ExpressionEditorPanel1);

4. Bind the C1ExpressionEditor and C1ExpressionEditorPanel components using ExpressionEditor property exposed by C1ExpressionEditorPanel class, as shown in the following code snippet.

   C#	Copy Code
   // Binding ExpressionEditor and ExpressionEditorPanel c1ExpressionEditorPanel1.ExpressionEditor = c1ExpressionEditor1;

5. Add the appearance settings to the ExpressionEditor and ExpressionEditorPanel:

   C#	Copy Code
   // Add appearance settings c1ExpressionEditorPanel1.BackColor = Color.LightGoldenrodYellow; c1ExpressionEditorPanel1.ForeColor = Color.BlueViolet; c1ExpressionEditorPanel1.Font = new Font("GenericMonoSerif", 10); c1ExpressionEditor1.BackColor = Color.Beige; c1ExpressionEditor1.ForeColor = Color.Firebrick; c1ExpressionEditor1.Font = new Font("GenericMonoSerif", 10);

6. Bind the ExpressionEditor control to a data source.

   C#	Copy Code
   c1ExpressionEditor1.DataSource = DataItem.CreateData();

7. To create result panel, add a label and a text box control.Set the text property of label to Result, and name the text box txtResult.

8. Subscribe to the ExpressionChanged event of C1ExpressionEditor, and handle the ExpressionChanged event to show result of the entered expressions, as shown in the following code snippet.

   Example Title	Copy Code
   c1ExpressionEditor1.ExpressionChanged += c1ExpressionEditor1_ExpressionChanged; } private void c1ExpressionEditor1_ExpressionChanged(object sender, EventArgs e) { if (!c1ExpressionEditor1.IsValid) { txtResult.Text = ""; } else { txtResult.Text = c1ExpressionEditor1.Evaluate()?.ToString(); } }

9. Build and Run the Project. Observe the output. Add the date and days in AddDays formula in the top textbox after adding the formula.

   

   Note: WinForms .NET Edition does not include rich design-time support yet. We will enhance it in future releases.