Use a variable from another method in C#

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You should read up on scoping… http://msdn.microsoft.com/en-us/library/ms973875.aspx

One way is for your _Qd and _Gd to be at the class level, not defined within the methods themselves, so that you have access to them in the click method.

private decimal _Gd;
private decimal _Qd;
public void readG_TextChanged(object sender, EventArgs e)
{
    string _G = readG.Text;
    _Gd = Convert.ToDecimal(_G);
}

public void readQ_TextChanged(object sender, EventArgs e)
{
    string _Q = readQ.Text;
    _Qd = Convert.ToDecimal(_Q);
}
private void button1_Click(object sender, EventArgs e)
{
    decimal _ULS = (1.35m * _Gd + 1.5m * _Qd);
    Console.WriteLine("{0}",_ULS);
}

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