SqlConnection con = new SqlConnection("Data source=(local);initial catalog=HesabDariDB;integrated security=true");
    SqlCommand cmd = new SqlCommand();
    private void FrmTanzimat_Load(object sender, EventArgs e)
    {

    }

    private void btnSave_Click(object sender, EventArgs e)
    {
        cmd.Connection = con;
        cmd.Parameters.Clear();
        cmd.CommandText = "insert into Tanzimat (NameFroshqah,Tel,Mobile,Address.Tozih)values(@a,@b,@c,@d,@e)";
        cmd.Parameters.AddWithValue("@a", txtNameFroshgah.Text);
        cmd.Parameters.AddWithValue("@b", txtTel.Text);
        cmd.Parameters.AddWithValue("@c", txtMobile.Text);
        cmd.Parameters.AddWithValue("@d", txtAddress.Text);
        cmd.Parameters.AddWithValue("@e", txtTozih.Text);
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
        MessageBox.Show("done");
    }
}

CREATE TABLE [dbo].[Tanzimat] (
    [idTanzimat]   INT            IDENTITY (1, 1) NOT NULL,
    [NameFroshgah] NVARCHAR (50)  NULL,
    [Tel]          NVARCHAR (50)  NULL,
    [Mobile]       NVARCHAR (50)  NULL,
    [Address]      NVARCHAR (MAX) NULL,
    [Tozih]        NVARCHAR (MAX) NULL,
    CONSTRAINT [PK_Tanzimat] PRIMARY KEY CLUSTERED ([idTanzimat] ASC)
);