如何将文本转换为整数？

Question

我试图更新我的表，但出现了这样的异常：“格式不正确”（英文，“输入字符串格式不正确”）。数字？

public cordonnes(String tel, String adresse, String password)
{
    InitializeComponent();
    textBox1.Text = tel;
    textBox2.Text = adresse;
    textBox3.Text = password;
}

private void button1_Click(object sender, EventArgs e)
{
    if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")
        MessageBox.Show("SVP Veuillez remplir tous les champs ");
    else
    {
        SqlConnection con = new SqlConnection(connectString);
        con.Open();
        int text2 = System.Convert.ToInt32(textBox2.Text);
        string cmdString = "update inscrit set adresse ='" + textBox1.Text + "',tel='" + text2 + "' , password ='" + textBox3.Text + "'";
        SqlCommand cmd = new SqlCommand(cmdString, con);