C# 将数据从SQL加载到combo并保存所选值

我尝试将值从sql数据库加载到combobox，单击按钮后，我想将combobox的选定值保存到变量

这是我的代码：

SqlConnection con = new SqlConnection(connectionstring);   
con.Open();
string strCmd = "select id,Prijmeni from Osoba";
SqlCommand cmd3 = new SqlCommand(strCmd, con);
SqlDataAdapter da = new SqlDataAdapter(strCmd, con);
DataTable dt = new DataTable();
da.Fill(dt);
comboBox1.DataSource = dt;
comboBox1.DisplayMember = "Prijmeni";
comboBox1.ValueMember = "id";
comboBox1.Enabled = true;
cmd3.ExecuteNonQuery();
con.Close();

private void Ulozit_Click(object sender, EventArgs e)
{
            //How i could save selected value of combobox to variable Value1 ???
}

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您有什么想法吗？

您可以通过以下方式保存所选值：

var Value1 = comboBox1.SelectedValue;