how to fix this please help me how to get the some of the items in listbox and be put in the textbox

[denver_kun]

• String headers = "{0, -20}{1, -30}{2, -20}{3, -20}";

private void button4_Click(object sender, EventArgs e)
{
int sum = 0;
for (int i = 0; i < listBox1.Items.Count; i++)
{
sum += Convert.ToInt32(listBox1.Items);
}
textBox3.Text = sum;

}

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