Fetch different form control value from different form

In case of Windows application, Either you can use Properties or Use parameterised constructor to do the same.

Using Parameterised Constructor
---------------------
Write the following code on button click event of Form1

Form5 f=new Form5(textBox1.Text);
f.Show();

Get the value in the Form5 as
string sValue;
public Form5(string s)
{
   sValue=s;
}

Using Properties
-------------------
Define the property in Form2 as

private string sValue;
public string Value
{
    get{return value;}
    set{value=sValue;}
}

and use the value of the variable as well.

Setting the value of textBox1 in Form1 as:

Form2 f=new Form2();
f.Value=textBox1.Text;