[Solved] Calling a function and text box from a button

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You probably don’t want to return an exception from that method. It could use a void return type instead. For example: 

private void button1_Click(object sender, EventArgs e)
{
    Student student = new Student();//set up student obj...
    string city = "Foo";

    searchCity(student, city);
}

public void searchCity(Student student, string searchCity)
{
    //Do your search...
    //set the data source of your gridview

    dataGridView1.DataSource = City;
    dataGridView1.DataBind(); //Make sure you call databind
}

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solved Calling a function and text box from a button