Send Data Between Win Forms In C#

In this blog, you will learn how to send data between two forms in a desktop application using C# language.

Many times, we need to send data from parent form to child form and vice versa. In the below blog, I will demonstrate both.

 

For this, you need to create a desktop application and 2 WinForms.

 

 

 

The above picture is form1.cs that represents the Parent form.

 

Here, we write a name and click on the button to send the data to the child form to get the age.

private void send_btn_Click(object sender, EventArgs e)
{
    string name = name_tb.Text;
    Child form = new Child(name);
    form.ShowDialog();
    result_tb.Text = form.SendData();

}

You need to create an instance of the child form with 1 parameter constructor and send name to the child.

 

In Child.cs, you need to create a parameterized constructor.

public Child (string name)
{
    InitializeComponent();
    name_tb.Text = name;
}

And assign the name to the textbox which is present in the Child form.

 

Now, to send the Age back to parent form, you need to create a Public method in Child.cs.

public string SendData()
{
    return "Age of " + name + " is " + age_tb.Text;
}

Now, call this method in Form1.cs to get the value of Age.

private void send_btn_Click(object sender, EventArgs e)
{
    string name = name_tb.Text;
    Child form = new Child(name);
    form.ShowDialog();
    result_tb.Text = form.SendData();

}

That's all.

 

Summary

 

To send data from Parent to Child form you need to create a parameterized constructor.

 

To send data from Child to Parent form you need to create a public method in Child class and use the method in Parent class to get the return value.

 

Watch the video tutorial by clicking on this link.